If you've ever jumped on a trampoline and realized, "Huh, this would be way more fun if there were some sort of intense combat sport involved," you're not alone. Hammacher-Schlemmer, the company responsible for half the ridiculous(ly awesome) stuff in the Sky Mall catalogue, has a "Spaceball Trampoline." Apparently it's kind of like a trampoline crossed with handball crossed with the ancient Aztec sport of guaranteed to look like an idiot while playing, so that's a nice side benefit ...