I got my first Basic D&D set for my 14th birthday (summer '78). My best friend and I desperately tried to understand the game but it was completely foreign to anything we'd played before (stratego, risk) that we couldn't get it. My mother called in a friend of hers whose son was a Dungeon Master and he spent several afternoons that summer running unconnected game sessions and teaching us to play.
I ran my first game with my best friend and my brother in November of that year, and started my first campaign with my friends over Christmas break. In the 26 years since I have been almost exclusively a GM, mainly becuase I can hardly ever convince any of my friends to run. I have had some very memorable moments as a player, however.
In this time, I've run six different campaign worlds (one Grayhawk, five homebrew worlds of vastly different depth and quality), but have only managed one TPK!
Actually, I'd like to think the players managed that one all on their own ...
--Mark C'sigs