No, I've never worked in a bookstore, surprisingly enough. It would have been a natural fit, but somehow the circumstances never aligned to allow it to happen.
I think that's the way most jobs occur, even careers - you fall into the opportunity. Writing is one of the few careers not like that, I think. Maybe because it takes so much persistence and effort, but no one just offers you a job writing novels.
And yes, most of the jobs I've held were offered to me. My favorite way to do things. I've held all sorts of jobs through the years, as most of us have. So I think we should play the Three Truths and a Lie game (only this is 13 truths). Below is a list of all the jobs I've worked. One is not true. A random commenter who guesses correctly which one is a lie gets a copy of Rogue's Pawn (either pdf or epub).
Ooh! My first Rogue's Pawn giveaway!
2. Runner for a law firm
3. Unaccompanied Minor Runner for United Airlines
4. Movie theater concessions girl
5. Apple picker
6. Cocktail waitress
7. Restaurant hostess
8. Lake water sampler
9. Lab technician
11. Editor for a chemical/petroleum group
12. Environmental consultant
13. Newsletter editor
Okay, let's hear those guesses!