Bored to death? Try chess boxing, a strange hybrid fast gaining popularity in Europe. In matches that bring in up to a thousand viewers, players alternate between making chess moves on a rigid clock and then exchanging gloves up to five 3-minute rounds. Tagged as the ultimate combination of brain and brawn, competitors can win either by checkmate or by KO. Be on the lookout for a rival with a killer right rook.

Read how Mike Tyson can beat chess Grandmaster Alexandra Kosteniuk here.