This is a homemade (you can tell by the beach towel) drinking Battleship setup. If you do the math (which I had a friend do for me on account of the double digits), the loser winds up taking 16 shots. That's a lot. Unless they're playing with beer (which I suspect), then it's
less a waste of time.
Thanks to David, who leaves tips on Geekologie's Facebook wall like a cat leaves dead birds by the back door. Daaaaaaw, are you trying to impress me?!