You'll need: a shoelace, an oven rack, two fingers, two ears
What you do is wrap one end of the shoelace around a finger and put the other end through the oven rack. Wrap the second end around your other finger. Now stand with your fingers in your ears and let the oven rack hang loose.
as such:

If you have a friend around, have them hit the oven rack with a metal spoon or other object.
Enjoy the ride!
note: pretty much any metal object which can be suspended can be used.