For people who are afraid of clowns, this video won't help your psyche. For people that love pranks, you may proceed, because this is one of the more classic pranks you'll see on the internet.  

We have no idea whether some of these poor unsuspecting people found out that this was a prank. But for those o f you who love a good prank, this video involving killer clowns, this may be one the better ones we've seen in a while.