I was just looking for something for the Unknown Yard Apes (i.e. my children). Then someone reminded me about Archie McFee - the company that has more fun stuff than any three barrels of monkeys. If you have some time to waste (or even if you don't), go to their website.
I ended up gettting them a water rocket - cuz a summer without water rockets just aint right!
Feel free to vote on your favorite McFee product.