From Deuce of Davenport comes this video of Japanese Bug Fights. They put two bugs together and have them fight it out, most likely with rich Japanese men in suits watching and placing obscenely large bets on the outcome.

This reminds me of when my brother and his roommate caught a swarm of bees and a praying mantis in the same jar and had them fight. The praying mantis ate the legs off several bees and ripped them in half, earning his freedom, and a release back into the wild.