Here is a very cheap and easy April Fools prank guaranteed to drive your victim crazy.
Step 1: What You'll Need.
Stink Bombs (the ones in a glass vials) cost about £1 for 3 vials
Some Blu-Tack or gum
Some form of sticky liquid (Corn syrup, hair gel,hairspray, cooking oil works as well)
No toilet paper
Step 2: Strategically Placing the Vile(s)
Carefully lower the seat.
Step 3: Cover the Seat
If your seat is white, use a clear liquid. If your seat is almost any other color, syrup or oil will work fine.
After a could minutes, the seat will look as if it has just been cleaned (nice and shiny)
Step 4: Wait for Your Victim....
They will then spend the next ten minutes trying to wipe off what ever substance you used on the seat, forcing them to endure the horrible smell.
You could be extra mean, and make sure all the toilet paper is missing.
I hope you have enjoyed this instructable, and please use wisely, payback can be harsh.