If it’s electronic, you can get it cheaper online. Usually a lot lot cheaper.

Order an espresso with extra ice and use the milk from the condiment bar. Instant latte, and the coffee bar hates you.

Turning it off and back on again. Actually, on second thought, the IT guys don’t hate this trick at all. They would rather you use it because then you won’t bother them.

They hate it when you ask to be put on their “do not call list” because they are legally obliged to do so.

They hate it when you take a few hours to learn things about your car like how to change the oil, the fluids it needs, easy fixes, etc. This is because informed customers don’t typically pay to have their blinker fluid changed. Also, they don’t want you buying a Honda. Those things never break.

When you go to the store right before they’re closing, you’ll often be the only one in the store, and you can often stay and browse around for a bit. This is because many stores (in the US) have policies that prevent them from just throwing customers out. Keep in mind though, the people working their probably won’t be too keen on your behavior.

In the US, ordering your drink without ice gives you more soda or whatever it is that you ordered. The company deliberately instructs its staff to put ice in the drinks by default to cut costs.

Skiplagged is a website that lets you find cheaper flights by booking past your destination. This is because if you are flying from point A to B, sometimes a flight from A to B to C is cheaper, and you just get off at B. Airlines really do hate this site.

They hate when you use fiverr. Of course, this is basically outsourcing because you’re paying somebody in the Philippines to do something for much cheaper. But we get mad when big companies move jobs overseas, right?

They don’t like when you ask for your prescription information e.g. the distance between your pupils. This is because they know that you will try to buy your glasses online, which is cheaper than the glasses they sell. Legally though, they are obliged to tell you.

In the United States, selecting Spanish will often lead to faster service. Most of the operators will speak English anyway.

The only reason there are so many IT professionals is because there are so many people who don’t know how to google the fixes for relatively simple problems.

Although the “I want to cancel my service” phone call can potentially get you some good deals from the retention department, companies definitely don’t like people abusing it.

Many grocery stores in the United States have a policy that if an item rings up at the wrong price, you get that item for free. Do what you will with this information, but know that cashiers will hate you.

Just do your taxes online. It’s easy and way way way cheaper. The tax preparers will hate you!

Many police departments will unlock cars for free (at least in some parts of the US).

In the United States, water is almost always free. You can ask for it to come with a lemon. And there is always sugar at the table. Instant lemonade.

While not counting cards isn’t illegal, the casinos hate it and will throw you out for it.

Adblockers. They hate them.

being smart and ignoring them. They hate this trick more than anything

Paying your bills in advance. They hate when you do this because they don’t make any money off of you.

Realizing that you can get an education for free online. Or, if you live in the US and can’t afford school, go to Europe. It’s either free or really cheap.

Science. They hate when you get into it.

Many clogged sinks can be fixed with a regular sink plunger. For some reason everyone seems to use those on toilets…

Ask about prepaid discounts for procedures you know are going to happen like childbirth. Sometimes the price can fall from over $10,000 to only a couple thousand.