Payback pranks?

So this boy that lives down the street from me that i had been.. well ...messin around with ...apprently had a couple of other girls that he was messin around with too. see his deal was his parents were buisness people and always working late or going away on buisness trips... and so he would always have them hire a baby sitter for his three year old sister so he could "do his homework" well turns out there were three baby sitter that would come over on diffrent days... well one day we all found what was going on.. and decided to get revenge.. sotfta oa john tucker must die kinda thing.. but we need some really good idea.s. sooo help??