Superstar
I don't know how such an amazing and bizarre game like Headis was able to stay under my radar for so long. The Headis game is a mixture of ping pong and soccer, with players using their heads to hit a big bouncy ball across the table.

Headis was invented by René Wegner, who started hitting a soccer ball back and forth over a ping pong table while he was a student at the University of Saarbruecker in Germany. Check out the featured video to see a game of Headis being played.