Man, I hear that. I also have a Ph.D. in astrophysics from Caltech (proof: http://resolver.caltech.edu/CaltechETD:etd-05222003-161626). I feel stupid all the time, but then, like Rock, I think "How stupid can I really be?"

N.B. I meet retreaded physicists all the time in tech. Case in point: last week I met the CTO of Aptana, who wrote a particle physics thesis at Harvard with Shelly Glashow.