What was the pettiest thing you have done?

Wollyhop thought this was worth mentioning said
8

Being petty can be fun. I usually don’t like to be petty, but if my brother ends up pissing me off to a certain point, I will do something bad and frame him, or bring us both down to punishment. What have you done, or if you think you are perfect, what was the pettiest thing someone else did?