Do you need a prank?
seeking revenge for anything?
That's perfect for you!
just follow the steps in this instructable and enjoy your evil (MUAHAHAHAHA!)
Step 1: Material.
You don't need much material.
Finger paint. ( I used black, but you can also use other colors, red is fun)
Syringe (that's the best, but you can also use a spoon)
Your victim's shower :B