When I was really young I wanted to be a farmer, with a farmhouse and tractor (I lived in a town and my dad worked in a factory, so this was probably a pretty crap idea).
Later I wanted to be a scientist (although I didn't really have a clue what scientists might actually do, except stuff I'd picked up from films). Studied chemistry eventually (maybe because it reminded me of the stuff I'd seen in films, bubbling tubes, fuming beakers etc). The word scientist does appear on my business card, but i'm not really a proper one.
Not sure what I want to have a pop at next.