What pranks did you pull as a kid?

At the end of Home Economics class, I'd set the alarms on all the ovens to go off 5 minutes after each other, 20 minutes into the next lesson.

I’d take a bic pen and a bendable straw take apart the pen so that all I had left was a clear tube attached it to the bendable straw attached the straw to the hose in the toilet that fills the tank and place the pen just under the porcelain lid aiming it toward the person who flushed the toilet they’d get sprayed

I really wasn’t much of a prankster.