ok, i know a couple ways to get SERIOUSLY even with someone. I don't know if it put this up here yet but here it goes....
get a box of frosted flakes and dump it on the front windshield of their car. because of it's size and shape it will cover the windshield and stay there while they drive. I mean they have to spend quite a bit of time digging it all out and they will just assume that it will come out all while they are driving. But it doesn't, it comes out sporadically and pises them off more and more as they drive home. DON'T do it in the rain tho, the results are messy...
Or you could do what someone did to me and just put a BULLET-HOLE sticker on their window. I mean really, i was like who put a hole in my window? Man was i upset...
P.S.-If i find out who you are i will kill you. The best thing to do would be to turn yourself in and just take a severe beating and forgo the whole painful slow death thing.