Drat, I can't beat the one about the straightjacket! But I had to mention my two favorite tees: both have one of those circular, academic-looking college emblems in the middle. In passing they look just like tee shirts from any university. But around the emblem, one sez "Psychotic State" and the other sez (you guessed it ) "Neurotic State."
I'll forget I have one of them on and someone around me will start laughing, maybe even pointing... Good thing I usually figure it out quickly (even in my typical Neurotic State)!
Hey, those tees would be easy to reproduce... Mine have no brand/copyright on them or anything...