Pedro in Spain wrote in this tip about a game phenomenon called Bossaball, which is "a mix of volleyball, soccer and gymnastics on a pitch of inflatables and trampolines (a big bouncy arena)." According to Wikipedia, it's also based on a fourth sport, copoeira (a Brazilian martial art). Sounds really crazy and fun, and maybe a little dangerous too, with all that movement happening while players are flying up in the air.

I won't even attempt to understand the rules -- see videos of the game in action on YouTube.