True story: Two mortician's apprentices work together at the local morgue. They're pretty good mates, and they love throwing practical jokes at each other - you know, the occassional odd noise, lights going off, that sort of thing. So one day early on one of the apprentices decides to give the other one the ultimate fright. He dresses himself in one of those sheets and lays inside one of the cabinets. These cabinets are like filing cabinets - only one sheet of metal on the bottom to lay the body on, and no metal on the sides, just a strip up the top for resting on the castors. It's so that the air can flow around easily in the refridgerator, but like the fridge, it's dark inside. So he's in there for an hour. Another hour passes. It's getting on into the third hour and he's feeling a little chilly. So he lifts his watch to his face and presses the button to light it up to see the time. And a voice next to him goes "Jeezus, you scared me!"