Mauricio Harion, a product design student from Belo Horizonte, Brazil, made a drinking game based on Battleship. When you hit an opponent's ship, they have to drink a shot.
This is the Enigma, the classic Battleship game turned into a simple to play (and fun) bar game. It's played just like the usual Battleship game with one addition. If you miss the target you drink a sip of water, and if you hit an enemy boat you opponent empties the corresponding shot glass.