Hmm. The parents thing was the obvious choice. However, I've never been pushed like that. Honestly, I have the laziest guidance people as far as teachers, parents, and friends go. From my town, if you were doing well in school the idea was that you will go places.
Even in college, I've been in three labs because they were so unmotivated to get me excited about research. I really asked to the point where they practically offered the door when I wanted more to do.
My basic drives have come from experimenting with life and feeling really good about things I'm doing. I never turned towards people to offer me that directly, but rather made it into something for myself. (Wow, that seemed a bit pathetic, but so it goes...)
Maybe my question is a bit generalized, let's try a real example of a question:
Who would you consider to be the most influential person in your life and why?
-UC Davis 2006? (Something like that.)