I was just the right age when GTA 1 was released, I think I was either 13 or 14; But I remember getting a demo of the game, which came on like, 7 floppy discs. It was a timed demo, so you could pretty much do anything you wanted within the timeframe and I'd play this demo for freaking hours.

Funnily, nobody ever seems to talk about GTA 2 or the London based expansions. They were great games.