Replying to War with my roommates..

ok heres the story... my roommate took my car, parked it a mile away, and told me it got repo'ed. he even had a business card for the repo company, causing me to flip out and all. he didnt return my car for a day, which was a pain in the ass. so i decided to get the 2 roommates back, and hid one's mattress for the night, and flipped another ones bed (having the egg crate matress upside down) and made it look like i didnt do anything by putting the sheets on top and all. he actually just plopped on the bed and hit the wood pretty hard, which was pretty funny.

this led them to getting me back by stealing my tv, laptop, and chair for a whole day. now i'm trying to think of a good comeback without breaking things or being a perv... any suggestions?