I don't remember when, but my first 'race' would have been one of the enduros during the county fair at Scott County in the '80s; my dad's cousin used to race them.
Then sometime when I was in middle school Dad took my brother and I to Salem Speedway on 'Scott County night.' I loved it and wanted to go more, but nobody else was really interested.
Fast forward to 2005; I was playing around with demolition derbies. One Saturday I was driving home from my boss's house (where I worked on my derby stuff) and saw a bomber on an open trailer. I was intrigued, thought it must be going to Brownstown, looked up directions, start time, etc. online, and drove up to Brownstown with my cousin and a neighbor. I went a few more times that year, then went to Bloomington Speedway for the first time in '06 (my brother went to IU); my jaw didn't come off the ground the whole night watching the sprints. Went to a few more races that year, hit a ton of races in '07, worked on a car in '08, bought a car and raced some this year in '09. Now when I walk past the window at work I see my sprint car on an old open trailer waiting to be taken to its new home down in Louisville to get redone for 2010.

That was an awfully long post to not even really answer the question.