Crab Ball is a crazy funny Flash game I found at Spikything.com, though a word of caution: the site includes annoying pop-up ads. But the game is just too fun to not give it a try. There is a single player mode against the CPU, and a 2-player mode you can play with another person using the same keyboard. Hilarious fun, and just in time for beach weather, too!
Update: If the game doesn't load by using the links above, try this version which only offers single player mode.