I grew up on bikes. Did group tours through high school, consistently lost races in both uscf's and norba's junior class, started working at a shop when I was 14. I went back and forth between mountain and road bikes for a while before I settled on mountain bikes as decent jack-of-all-trade bikes.
When I turned 18, the son of the owner of the bike shop brought me back a track hub from japan. I built it up with a good ol' MA-40, slapped it on the back of an ugly old nishiki, and that was my first fixed gear.
Twelve years later, I only have one of my old fleet left..
..sorry, it's not the fixed gear. I still ride one, though.