An astronaut, a scientist (as in the kind who always wears a white lab coat and pours bubbling multicolored liquids from one test tube into another)...and a construction worker. Simultaneously. Clearly I should have grown up to start a program for the construction of a near-earth-orbit chemistry lab.
Later I wanted to be a National Geographic photographer, and still kind of like the idea, because it sounds like one of the most interesting jobs in the world. Of course it's also one of the most difficult to get into.