Share your worse revenge story. Don't justify why you did it; just the worse thing you have done to get revenge.
Today was by far the single worse thing I've done in my life. I opened my victims shower head, put hard candy in it, and then when they took a shower the warm water melted the hard candy and got into their hair; making it all sticky. Then right before they left for school in the morning I threw a bucket of glitter on them. It stuck all over them, especially in their hair. It was hilarious and they had it coming.