LOL or you could allways act like your going to tell them sorry and give them the stink fist!!! moth balls or sugar in the gas tank works good. do somthing that will cost them alot of money cause people hate to spend money on replacing things or other crap but just dont get caught or u might be the one paying. also put bologna on thier hood in the sun and it leaves light colored spots like polka dots. whatever you do play it cool