A complete accident.
I got Portal during that free deal thing. Never got to play it because my computer was old.
After a year or so I got my laptop and I was finally able to play it. I made some random friends after that, got gifted a game, and started getting cheap humble bundles, and finally bought stuff on steam. I bought CS complete and Garrys Mod just for TTT lol. Those 2 things were also my first purchases on steam as well.
Gotta say the free Portal thing was genius of Gabe. Without it, I don't think I woulda ever fell into PC gaming. Buying a PC soon as well, but I don't now what parts I'm getting exactly.
I think my story for joining the Mustard Race is pretty cool/weird/funny.