Fluid Dynamics in Pong

http://www.plasmapong.com/

A game released this year that is a variation of PONG. It uses real-time fluid dynamics to drive the game environment. You can inject plasma fluid into the environment, create a vacuum from your paddle, and blast shockwaves into the playing area. All having fluid-based kinetic effects on the ball.

The game is fun, plus if you press F1 after entering the game, you can create your own effects using fluid dynamics.