Heh heh - Dungeons and Dragons for me. In 1973 it took my 15 year old introverted self firmly out of my shell. In order to play this game I had to drag my friends and their brothers - not -quite- by main force as a group into a room and make them roll characters. Then I needed to do the whole act out/narrate/referee thing. [And they loved it - but in the course of this game, it forced me into becoming an extrovert.] Best game EVAR!