My first "real" bike (i.e. adult-sized machine, purchased from an LBS) was a 2005 Trek 820, in yellow & black. It was a cheap, entry-level all-steel "mountain-style" bike, but I loved that thing! Riding it all around campus helped me to slim down, improve my health, and enjoy the daily trip to classes. I awoke one terrible morning to discover that it had been stolen off of the bike rack in front of my apartment at college. That was the day I learned to distrust cable locks. Here's a pic of that bike taken on a wint'ry day on campus...
Hey, at least I had a plastic shopping bag protecting the saddle, right?

I ended up replacing my stolen 820 with a new Trek 4300 (in theory, a superior bike with better specs, but it never rode quite as nicely as that steel 820 did).