50 years ago when in boarding school, an expression indistinguishable from Homer’s “doh” was a popular reproach to another teenage dope’s intellectual vacuity of the moment. No one escaped the title! How did it transit all those decades?? Is this just another item in the records of the eternal return?? If the latter, then ‘doh’ arises from a deep cultural meme or, as the neuropsychs might have it, hard-wiring.