Back in the day I had an Atari 2600 and I really wanted this Activision game, I think it was called Space Blaster or something like that. Well I got the game on Christmas day and that night got into a total groove with it and found a pattern (you basically did the same thing on every screen) and racked up about a million points over the course of many, many hours on one game.
I think I only played it maybe once or twice after that.