Here's a peach that was passed to me by a male friend:
Ok, so you've finally seen the light and decided to leave that scum bag boyfriend of yours. Unfortunately, leaving means you are abandoning your shared accommodation. You want to leave with your dignity by being the adult in the situation ( i.e. not burn his CD collection and give all his cloths to the homeless) but you just can't bear that he's getting off so easily either.
Hit him with this subtitle but effective revenge tactic: Batteries. Turn every batteries from every appliance in the house the wrong way around. Do not remove! If they've been removed then it becomes obvious whats happened. You want him to wonder if all his stuff is broken. That means the TV remote, mouse, keyboard, power tools, anything! It'll drive him mad for weeks.