Ahem, I don't believe Shemp had a mental disorder at all. Shemp left the Stooges in 1932, because he didn't want to go back with Ted Healy, and Larry and Moe did. (That's when they brought Curly in). Apparantly Shemp had been offered other film parts in things such as the 'Joe Palooka' series....but I'm quite sure he wasn't mental - where you got that idea from I don't know.