Let's Play Some Headis!

Combine table tennis and soccer, and you get Headis. Headis was invented in 2006 when a German student, René Wegner, wanted to play football, but since the field was occupied, he suggested playing at an available ping pong table. That's using your head! The new sport caught on like wildfire, and before you knew it, there were Headis World Cup Tournaments. (via Metafilter)