When I was 19 my then girlfriend sent a tape of her cheating on me with an acquaintance. I was devastated so I sent that video to her parents. She wasn't allowed to leave the house after that lol.

I worked Comcast technical support. I had a customer that was so rude and nasty to me over the phone I spent the next 8 hours of my 10 hour shift constantly resetting his modem and cable boxes. It felt so good.

Went to give a guy a 10% raise. He said that’s what you give a janitor. I told him great idea, so I rescinded the raise and walked over to the janitor and gave him the $ increase the other employee was set to receive ($10,000) annually.

When my ex boyfriend and I broke up, he moved out and packed everything that was his. I later realised that he had taken all of my Tupperware lids and just left the containers. As annoying as it was to be left with lidless containers, I was in awe.

I stained my wife’s brand new white tennis shoes one time. When I woke up, I found she had taken one shoe lace from every pair of shoes I own and frozen them in a block of ice..

Built a FB page for my job since they desperately needed one. However, I did it under my personal FB account. Several years later I quit following a long history of abuse and toxicity. I still owned their (very active) FB page so I deleted it.

I signed an a*****e neighbor up for Scientology literature. Then, I ordered a gay magazine under her husband's name to her neighbor's house.

My ex (who cheated on me) loved a show on Amazon Prime that I never watched; after we broke up, I saw him post about having watched the penultimate episode and being excited for the finale, and I realized he was still secretly using my account... I promptly cancelled it, because I never really used it anyway. Sorry, a-hole.

I got on friendly terms with a bunch of door-to-door Jehova's witnesses. They were still visiting my abusive, atheist step-father's house years later.

Stayed in an AirBnB in Lausanne for 3 months and when I got there it was absolutely filthy. Rotting bananas in the fridge, bins not emptied, layer of dust all over the place. The agreement I had signed beforehand said to "leave the apartment as clean as it was when you arrived" so I went out of my way to stop cleaning the place two weeks before I departed, I made sure to fill up the bins and I even bought bananas to leave behind in the fridge. When the guy gave me a bad rating I replied with before and after pics and wrote that I had merely fulfilled the agreement.

Hotel I used to work at had a room that permanently smelled weird because a previous longterm occupant had simultaneously operated both a candle business and a puppy mill. General policy was not to put anyone in that room unless it was the only room available (and that time of the year, it wasn't). People who were jerks when I checked them in and only there for a night or two... got put in that room.

Parked in a public parking yesterday and this lady slams her door into my car as she gets out. Pretty standard mistake, all good if she says sorry BUT she looks at me and then makes a face, turns around and starts walking away. What do I do? Smash my door into her car. She noticed. So satisfying.

Guy dumped me in high school and he thought I was an idiot. I baked him a birthday cake and he immediately grabs it and takes it to his new girlfriend and their group. I knew he would " dismiss me" after getting his cake. Every last piece was eaten, my secret ingredient, 5 ground up cockroaches.

I quit a job without notice. Wrote a scathing email about the culture there. Set email on 2h delay send and I walk out. Screenshotted my desktop and hid my actual desktop files under mistitled subfolders.

My boss kept leaving his favorite coffee mug in the break room sink, despite a sign asking staff not to do so, for the housekeeping staff to wash. I was friends with the housekeepers and resented this. So I hid his coffee mug in the back of a cabinet in the mail room and then pretended to help him look for it. It stayed there for years.

When I was 7, my brother tried to play that age old prank on me where he offered me a soda that he had previously shaken up. Somehow, I felt that something was off and instantly guessed the real reason he was offering me that soda. Ah, intuition. I accepted the soda and, when he wasn’t looking, did the ole switcharoo with his soda and mine. I drank from my new soda and watched him open the tampered one. Mwahahahaha.

Years ago I lived in a six plex with my ex. There were three people (one man and two women) who recently moved in above us who all worked in the restaurant industry. Almost every weeknight they’d come home at 2:00am and proceed to BLAST their TV which was located above our bedroom. One night I finally had enough and went upstairs to knock on their door. The man answers and I proceed to ask him why his TV is so loud. He then informs me that it’s probably the SUBWOOFER. I ask him if he could turn it down and he responds with something along the lines of, “Well, after a long shift we all like to wind down and watch a movie. Turning off the subwoofer would decrease the quality of the experience.” I asked if he was serious and he just stared at me blankly. So I went back downstairs and informed my then gf of what happened and we devised a plan. All she had to do was take my dog to the office with her the next day. Little did the neighbours know that I had a full DJ setup ready to go with two KRK Rockit 5 monitors. I woke up at 5:00am to take my dog out for his walk and get ready for work. I then proceeded to make a playlist full of the most annoying songs I knew and put them on a constant loop. Songs like Hamsterdance, Friday by Rebecca Black, Cotton Eyed Joe, Crazy Frog etc. I set everything up so all my gf had to do was hit play on her way out at 8:00am, which she did. Never had to deal with the subwoofer again.

I bought my grandparents house after grandma passed away. My moms brother and sister, and their spouses were all money grubby and were big mad I paid appraised value instead of the overinflated price they were hoping to get if they’d put the house on the market. Needless to say, tensions were high. During this time my bro was getting married and he still invited the aunts and uncles who were being jerks to me. I was in charge of sending wedding shower invites, the stamps I chose were a mix of animal pictures. People I liked got horses or bunnies or cats - the “family” got rats and snakes. Small, but made me feel a tiny bit better.

Hiding potatoes in random spots at my former workplace.

A former employer (a small cafe) fired me for something that never happened and since their business broke so many health and safety rules (no hot water, dirty conditions etc) I decided to anonymously report the business to the council and got them closed down for weeks so that they could resolve the issues before reopening. I didn’t get them closed down entirely sadly, but I love that I cost them so much money.

Was staying in a shared dorm at a hostel in my mid 20's. My roommates were a group of really inconsiderate people who'd talk at full volume at all odd hours even when it was very visible that I was sleeping. The morning I had to leave was immediately after a night on which they'd been partying and went to bed late. I set an alarm on my phone for 6am, with the most annoying tone I could find, locked it inside my locker in our room and went to an external bathroom for a nice long shower at 5:55am. 45 mins that thing rang at full volume in my locker before I returned, woke everyone up. I just had to apologize for "forgetting" to turn it off.

Sent my exes meddling best friend screenshots that proved he lied to her to spend a weekend with me instead of her. I hope it ruined their friendship.

I was a teller at a credit union years ago. A customer came in and started barking orders, acting as though I was her assistant rather than just someone to take deposits. The whole time she name-dropped the credit union board members, the CEO in particular. I just kept my head down and took care of her transaction. As I finished, I told her I could tell the CEO she said hi if she wanted. She smirked and said, "Oh, you know him, do you?" I smiled and said, "Yes, I'll see him at dinner tonight. I'm dating his son." She blanched, grabbed her stuff, and darted out the door. As I suspected, the CEO didn't even know who she was until I explained who the deposits were for.

Had a bully roommate at summer camp some 30 years ago that made my life a living hell. The day before I left I took his toothbrush and scrubbed one of the toilets spotless with it.

Back in high school, I was around 14 and sat very close to the classroom door. One day, someone knocked, and I opened it without thinking. The art teacher got mad and told me not to do it again because she didn't give me permission to open the door, asking if I thought I was the doorman. I was shocked because I didn't think it was a big deal. Thirty minutes later, there was some knocking again. I waited for the teacher to tell me something, and she did—she told me to open the door. I simply replied, "I'm not a doorman; come and open the door yourself." She sent me to the principal to get a reprimand, but I didn't get any.

I was fired from a job when I exposed the new boss’s ineptitude. I asked for a reinstatement but was denied. So went to a group of attorneys that handled litigation for software companies. Told them how this company would buy a new copy of an application and install it on 400 workstations. And copy the manual, and train employees on these and acknowledge in class that everything was pirated. The owner is using company funds to pay for his mistress’s Lexus lease and her rent. He also was so cheap he tried to ration consumption of pencils. With my evidence, the attorneys sued and won $250k from the owner. That hurt him bad. My regret is he survived writing the check.

I had a supervisor once who repeatedly made comments towards me that made me feel uncomfortable. DMing me saying I'm beautiful and wanting to take pictures of me all the while in work meetings. Eventually I told a colleague and found out I wasn't the only one, he'd been saying the same thing to multiple women at the company. We did more digging and found out that he had a history of this behaviour even at previous companies. We went to HR and he got let go. Then I joined a new company and a month later he joined too. I found out that in between those jobs he'd harassed a receptionist to the point she openly cried and quit her job. So when I saw his name pop up I went straight to my current HR and told her what I'd experienced. He was immediately let go before he could repeat that behaviour. From then on I've made it a personal mission to tell every woman in my industry about this guy. F**k him.

At the gym in the locker room, a guy would get in the locker room to shower as I was getting dressed. He was some sort of banker and always asked me questions about my job in a condescending way. One day, as I was leaving, he was going into the shower and had some of his clothes laid out on a bench. On my way out, I grabbed one of his socks and threw it in the trash.

My MIL is perpetually late. Wouldn't matter if it was dinner with the Pope. She'd be late. When my wife and I only had one car she would pick up our boys to watch them at her place a few days a week. We live 8 minutes away. She was supposed to pick them up at 8. Not once in 2 years did she get them on time. And I would be running late to work. When we finally got a second vehicle I started dropping them off. I would get to her place 5min early everyday and she would still be in bed and come out in her PJs and end up staying there with the kids until she got dressed. She doesn't have boundaries and my wife and I have a very strict, "nobody's bedroom but yours" rule for our kids. (There is a lot more to this whole portion of it but that's another post for another day). Once she would get used to it and be awake and dressed I would change the time. 745, 740... Then I would go the other way and do 815/830. Then back and forth. I would be as close to late to work as I could be just to f**k with her. It was so petty but it felt soooooo good.

My ex-wife ABRUPTLY wanted a divorce. She (unbeknownst to me) drew up a totally uncontested divorce contract. In it, she forgot to ask for her half of the bill for windows we had upgraded. I held up the contract and asked her (in the notary parking lot) if this is really what she wanted. She said yes. She wasn't happy when she realized it.