Halloween prank of the year may go to this flying Grim Reaper gag:
Comedian Tom Mabe and a friend decided to build a flying reaper to spook people. Little did they know how successful their device would be.
The reaper was attached to a small helicopter device and, when airborne, is nearly silent.
Can you imagine being out for a jog and seeing this specter chasing you?
(thanks to Steven Burnett)