Is this the greatest thing ever? Easily in the top 3. Check it out: the Airkick Human Catapult. Who do I have to kill to get one?
A few years ago I read an article in GQ (or Esquire?) about the Dangerous Sports Club. Their heyday was back in the 70s and 80s and they once invented a human trebuchet (see below). They are also responsible for bringing bungee jumping to the masses [side note: The idea for bungy jumping was inspired by the invention of bungy rope and the practice of Land-diving in Pentecost Island]. It is nice to see that their spirit of invention lives on.
Human Trebuchet in action: