Here's things we did to our friend Craig.

1. Saran wrap a common high-travel area at head-height so that first thing in the morning they clothesline themself in a tired stupor.

2. Put a dot of red food coloring on their toothbrush, then apologize for borrowing theirs.

3. Unscrew the showerhead, insert a cube of beef bullion into it and replace.

4. Drain their shampoo into another container, then fill the shampoo bottle entirely with pennies.

5. While they're showering, remove all towels from the bathroom.

Can't remember the others now but these were all great little annoying things, esp since they're first-thing-in-the-morning ones so you get 'em while they're good and stupid.

Steal his NWC Gold cart and replace the ROM chip inside with Deadly Towers.

What? Not everyone has a NWC Gold? Shucks.

I like the one with the cieling fan.......that's a classic. I think baby powder works better than flour, though.

One I did to my roommate was, we had one of those little hose things on the sink, where you press the handle and the water comes out of it. What I did was tape the handle so it was in the on position and pointed it directly where you would be standing in front of the sink. We were cooking in the kitchen and I told him to wash some potatoes. So he turned on the sink and got soaked with water.

That one :

^haha that was seriously awesome.

Powdered sugar works even better!

No wonder the poor bastard peed in your shower... Sheesh!

With powdered sugar or flour you're going to end up with either ants or cockroaches, and it will majorly backfire.

Baby powder gets the job done and is fairly "inert", outside of the fact that it will likely give the guy lung cancer later in life to have inhaled a bunch of ultra-fine dust.

This might be the best prank I've ever read about.

Burn some oregano and make his room smell all weed-ish.