Very good Sega game available in arcade and Dreamcast versions. It only uses directional buttons and two fire buttons, and on paper, doesn't seem much fun. But get a bunch of friends over for the multiplayer mode, and it really takes off. Simple to learn, and subsequently very hard to put down. The Dreamcast version also features some great sub-games.
Deuce / Advantage situations can get incredibly intense.
It's also a fine video game for people who don't like video games, in my experience.