Galactica--LOL! I remember my friend in 6th grade was good at that. I always got killed on the first screen :) My favorite arcade game is probably Ms. Pac-Man. I also love the old Atari home games.
My father loved Asteroids. And there's always Pong. (Now THERE's a retro classic!)
You know, they have a little vid-game system out called 'TV games' by Jaks Pacific. There are several editions of this $20 system that have old arcade games on 'em. One of them has a bunch of the old Atari games on it -- and another one has Ms. Pac Man! You can find it in toy aisles at Wal Mart.