This prank may be far too elaborate and overcomplicated to ever really work without a full-scale production crew, but in the video below you can see the life scared out of some unsuspecting passers-by -- and it's pretty hilarious.
This is certainly an elaborate trick. Right off the bat we count at least five people necessary to pull it off, as well as a full-size mannequin, a hole in a sidewalk at least five feet deep, plus a large piece of plywood.
And you're still only going to get a few friends with really poor eyesight.
That said, when this one manages to work, it really seems to work.
Check out the video to see the prank in action.