Short sheet the bed, where there's only one sheet but looks like two so when he tries to get into bed there's only half a sheet. Yeah, that's lame. Probably doesn't make the bed either. How about clipping your finger and toe nails into the bed so when he gets in he's got all those scratchy clippings driving him nuts all night. That's not too bad.
I wonder if the hand in a warm bowl of water thing would really work. Getting him to pee himself would be funny.
How about plastic wrap over his bedroom door so when he tries to walk out in the morning he walks into a wall of plastic wrap? Or plastic wrap over the toilet bowl. Chances are if the seat's down he won't lift it so he wouldn't realize until he's getting sprayed. Only pitfall is you live there so it's your bathroom too. You know he'll leave the pee for you to clean up.
Annoy him by flipping the batteries around in his remote.
Did you ever see the movie Meatballs? Do you have a lake nearby? Do you have enough friends that could help you set him and his bed afloat? Tricky unless he's passed-out drunk.
How about the movie The Hangover? Put his bed up on the roof. Nightstand too. Not with him in it unless it's a flat roof, it's a prank not a homicide.