My truck broke down and I could not afford the new engine. (ah, the Chevy Luv, the Vega of trucks)
My dad had a bike in the garage he was not using. I needed to get to work, so I got it running. Two years later I got a job, bought myself a new car and sold the bike. (gave my dad the $250 I got for it)
Five minutes later, I missed the bike. That's when I knew I was hooked.
As soon as I could afford it, I got myself another bike.