Originally Posted by Merlocke

Let's see... revenge...

Piss in a cool whip lid - pop it into the freezer. Voila: portable piss disk.
Slip it under his door and onto some carpet - the heat in Mexico will make sure it leaves a fun scratch and sniff present for him.

What else... since we're talking about cool whip anyway - fill an old record cover with cool whip - slide it just under a door, and drop a heavy book on it. You'll be pleasantly surprised with the trajectory and amount of surface area that tends to cover.

One to top it off - if you can buy bugs at a pet store (usually lizard food) - preferably something with wings - say... ladybugs. Pop the bag of them into a freezer for a bit so they stop moving (don't kill them). Now pour them into an open envelope and again with the door. Once they thaw out, they will be PISSED OFF. Naturally this will cause them to fly in and around everything in their vicinity - which includes the bodily orifaces of the person whom you detest oh so very much.

It's not quite turning rivers into blood or summoning locusts, but meh - it's a deity-like revenge on a budget... I know Karma will eventually take its time to arrive, but stress relief is a must (just don't get caught)