I've been building planes for my first 20 years and herding cats for the rest of my career and there is probably nothing in the world I'd be happier doing.
Note: those may be obscure references for some. http://www.youtube.com/watch?v=Y7XW-mewUm8 and http://www.youtube.com/watch?v=m_MaJDK3VNE should help.