Man THAT sucks! Same thing basically happened to my brother's DeLorean...and he got hit by one of his co-workers at a company dinner...and they ran. He ended up paying for it out of his pocket.

But you know what, since you know who did it...confront him about it. If he denies it...break his windows or slash his tires or something while he's not around....he'll know what it feels like then. Just don't get caught!