I'd been with this guy for a while, and was just about to go to Uni. I wouldn't make out with him, which he really wanted before I went away. Then one night I found out he had been with someone else, my friends caught him kissing a girl in a club, but he didn't see them.
Anyway, trying to work out the best form of revenge, I told him I was ready to go all the way with him, and on the night before I left, I went round to his house as his parents were away.
We were in his bedroom and I took out some scarves and convinced him the only way it was going to happen was if I could tie him up!
He took off his clothes, and I tied him to the bed. When I was sure he couldn't move I told him I knew all about his other girl, and how I really felt about him, then I left him there!
Apparently his brother found him like that a few hours later!
Didn't feel the least bit bad, he deserved it for cheating...