Some group that does prank videos on YouTube has a new one where one of them dresses up as a scary clown, and stands in a parking garage holding a huge mallet. And there's a fake dead body lying next to him.
Then when someone walks by, he uses the mallet to crush the dummy's HEAD . . . then runs after them. (Search for "Killer Clown Scare Prank." He pranks people at :20,:46, 1:15, 2:09, 2:25, 2:45, and 3:00.)