Toilet Bang!
Tape some boobie trap firecrackers to the toilet. Those are the ones with strings coming out of both ends. Just tape one end to the the seat lid and the other end to the seat. As soon as your victim goes to lift up the seat.....BANG!!!

Ketchup, mustard, and mayo prank
Fold a few condiment packets in half and tape them between the toilet bowl edge and seat lid. Make sure to place them near the back. When your victim sits down to do his business, he or she will get a ketchup, mustard, mayo explosion to his rear.

Toilet Paper Trail
Duck tape some toilet paper (to the entire roll) so it overlapse with the end of the toilet paper. Then lay it on the floor in front of the door. Make sure the sticky side of the tape is facing up. Your victim will then step on it and drag a whole roll of T.P. along with him.

Shiny Teeth
Squeeze some shaving cream into your victim's toothpaste.

Public Restroom Gender Swap
Switch the gender signs on public restroom doors while there are people inside. Then sit back and watch men go into the women's restroom and vise versa.

Piss All Over The Place
Use yellow food coloring to color some water. Make it look like urine. Then pour it all over the bathroom floor, sink, and toilet.

Restroom Airhorn
Follow your victim into a public restroom while carrying an airhorn with you and while he or she is doing their business either at the urinal or in the stall push the airhorn button. It will make the loudest noise and will echo off the restroom walls. It will freighten your victim big time!

Gum On The Toilet Seat
Place some sticky chewed gum on the toilet seat. Works best if the gum is the same color as the seat.

Reward For Lost Ring
Call a local plumbing company or handy man and tell them you lost your expensive ring down the toilet drain and that you will give a big reward to whoever finds it. They will take the whole toilet apart and have to put it back together and after searching all over they will never find a ring.

Public Restroom Poop Smear
After you take a dump in a public restroom, unwrap the toilet paper and smear some poo on it then roll it back up. This will make the next person who uses the stall to barf!