one day little johnny was very excited to get home and tell his mom and dad how well he did at school. when he got home, he ran in the house and then to his parents bedroom where they were having sex.

Johnny: Dad what are you doing!?
(runs out of the house)

Father: Johnny wait!

before his father could tell him to wait, he is out of the house. little johnny had went to his grandma's. about ten minutes later, his dad walks into her house and to her room to see his son on top of her.

Father: Johnny, what the hell are you doing!?!?!?

Johnny: its not so funny when its your mother now is it?