How do you prank people why sleep?

Here are some fun and not so mean pranks you can pull on your friends:

Discreetly place some bubble wrap around the rim of the toilet bowl and then gently lower the toilet seat onto it.

Cover a bar of soap with clear nail polish and your victim can scrub with this coated bar for hours without seeing a single bubble.

Change the settings on your friend's TV or computer so that they can't preform certain functions.

Stuff some cotton wool or other similarly soft material into the toes of your victim's favorite shoes.

Short sheet your friend's bed.