When you're looking to recreate your favorite scenes from Monty Python, the AirKick, a human catapult powered by steam and water, will launch your friends and victims over 25 feet in the air. So sorry to disappoint you, but you can't buy one of these in Australia. They're made in Germany, where you can rent them, and where we imagine people are spending all summer launching themselves into their neighbors' pools.
Expect to be seeing this on "Wipeout" and any other show that encourages people to risk bodily injury in the very near future.