My dad had various IBM computers in the house when I was a kid with what must have been Model M keyboards. I don't remember them specifically, but I remember being aware later on that the keyboards I was using were not as good as my dad's old ones.
Fast forward two decades to me requesting a Kinesis at work for ergonomic (and cool factor) reasons. I knew nothing about keyboards, but I knew I liked the Kinesis' sound and feel (it has brown switches). Keyboard talk in the Starcraft community prompted me to do some basic research and decide on getting something with blue switches at some undefined point in the future. Further research into dying keys (to achieve MarineKingPrime's checkerboard look) led me to geekhack.
After a weekend of reading threads and seeing everyone's tricked out keyboards I knew I needed to be a part of this community. I bought a Filco and a Unicomp within a couple of weeks. This was in July of this year, and I now own way too much keyboard stuff.

My favorite switch is a toss-up between blue and red MX. I've also spent some time with a borrowed Realforce, and I will definitely be owning one at some point. Typing on Topre switches is like biting into soft, chewy, delicious chocolate.