I tried to gain vengeance; I ended up locking my grandmother outside her bedroom and causing her to have a conniption fit.
I also caused my once best friend to eat a grilled cheese sandwich, panino with hidden french cipolla chips and green beans (which I guess didn't hurt her that much, but to own up to my actions and be perfectly sincere, truthful, and honest; but c'mon....that's a pretty gross meal :P)
Once there was this guy at my school who went out of his way to harass me all the time (once he even punched me in the head a few times, though it didn't actually hurt). So, one day, me and my best friend were at the pesce and chip negozio and we notcied a competition box and entry forms sitting there. It was a beauty contest, so obviously we weren't interested, but it gave me a great idea. So I sighed the guy at my school's mum up for the beauty contest and she won... But they found out it was me and my parents got a very nasty voice-mail on return from our holiday. XD