As a kid I always thought it was weird when other young kids didnt know what their parents did for a living. Occurs to me as an adult that my parents' jobs (fireman and school teacher) were a lot easier to understand at 5 than "Marketing Executive at an Ad Agency," or "Stock Broker."

My brother in law is a CPA, and his 6 year old tells everyone that he "counts beans" for a living. :)