Pranks

Prank is fun. The problem is that a very large portion of the population has no idea what a prank actually is, or how they work. And while it's merely annoying that most of your co-workers think a "prank" is nothing more than a random, pointless lie, there are always those few who go too far in the other direction.
Here's a collection of the greatest pranks mankind has ever pulled up for the rest of humanity.