My first play was Origins '78.
I was between sessions and had jsut enjoye a really fun tourney of (IIRC)"Cosmic Encounters". I remember the game(start with a colony, grow the conony and explore...) if I do not remember the name of the game...
Anyway, I was walking through the corridors not really sure what to do next and not really wanting to go back to the sales room and spend more cash until I had a chance to try some more stuff(I had dropped over $200 already >

)
Anyway, there was this tall dark haired bearded guy on the floor with a team of players arrayed around him in the obvious throes of starting some RPG. My friends and I had played T&T and Monsters! Monsters! as well as trying but not really liking D&D. We mostly liked Monsters! Monsters! because we could draw up nice medieval towns and then proceed to trash them until forced to flee...
anyway, I stopped very suddenly when I caught the map being used out of the corner of my eye....it was a space craft!!! I immediatly turned and started observing to find out they were just setting up and it was a space game. I do not recall the details of the stock character I was handed but joined in as the GM explained the basis of the scenario I would find out was called "Annic Nova". The way we played was slow and steady with rich descriptions and explanations. It was like taking part in writing a sci fi book or movie only you could stop and deal with the stupid "odd stuff" that always crops up. So eventually all us stock characters were loaded onto a fast space craft and blasted into an intercept course with the unknown and alien space craft with clocks ticking down everywhere to remind us fo the limited time. Being 16, unfamiliar with how Traveller ships worked and a hapazard group, we all chose to make our way to the bridge (No, "you take the bridge and we'll hit engineering" to maximize chances)
Anyway, my character turned out to be the single most important actor in the bunch. Why you ask? Because once we reached the bridge, and with very little time after gaining that deck, my character found a "T" handled control(much like a throttle...forward and back) and rammed it completely forward....
It was the gravity plate controls.
I had turned the entire party into jelly and the game was ended....
Not with a whimper or a bang...but with a splat....