better still,get them so hammered that they have no clue where they are,and will have no memory in the morning. Go to your revenge kit,which comprises of some human hair,and some pig brains/bones/flesh. Stick a massive dent on their car,and wedge the hairmflesh and brains in the grill,and on the nice big dent you've made. Leave messages on their answering machine from "the police,wanting to talk to him with reguards to a fatal hit and run incident" Shit bricks time(you could also stick some choclate buttons up their bottoms if you like)