Hairy Lightning Strike
You wet a balloon, rub it in fur, wear socks, charge it up, put it on like a condom, blow it up, and send a shock that makes someone scream and mess their pants.
He did it to his brother and the brother peed his pants in front of everyone.
She did it to her dad and he yelled and dropped his phone in the toilet.
At the sleepover, they did it to the kid and he ran out crying.