roomate revenge

Ok so here's a brief summary of my situation. I've been in my current apartment for almost a year and the lease is up. During that time I've been living with the roommate from hell. He does whatever he wants, much of which is completely inconsiderate/rude to me. Mostly its indirect stuff but a number of times he's been a blatant asshole to me. Its been a nightmare but now I'll be moving in my own place very soon... and I want a little payback before I go.

I've taken a look at his life and his possessions and he doesn't have much of either. The only thing that he has that I could mess with that would really stick it to him are his electronics. He has a pc, a laptop, xbox 360, xbox one, and a widescreen monitor. I would like to destroy these. But I can't just use a hammer or something like that. The blame would obviously fall on me and I would have to pay to replace his stuff. I have to do something sneakier that would, at most, put suspicion on me but not enough to prove anything. What I'm thinking of doing is just before I leave, I wait for him to go to work. Then I take the electronics, fill up the bath with water, plug them in(using a surge protector), and dump them in one at a time(either turning them on before or after they hit the water). I empty the tub of water, let his stuff dry for a while, then test to see if they still work. If any do work then I just repeat the process. He works eight hour shifts so I have time.

Here's where I'd like your input. Don't bother telling me to take the high road because I'm committed to doing this. What I need to know is will my plan work the way I intend? I want his stuff ruined without the chance of recovering any of it. Will the water do enough damage that it can't be repaired by a professional? Do I need to rearrange the steps of my plan(like when I turn things on)? If this won't work what else could I do? Keep in mind it has to be something that can't be proven I did and I can successfully deny if taken to court. Money's tight right now so it can't be something expensive to do either.