Not that this has anything to do with capos, but since Segovia has entered the thread, I remember reading in Groucho Marx's autobiography that he once invited the Maestro to his house and in the course of the evening handed him his beloved (and wxpensive) Gibson f-hole guitar to play.

Segovia fingered a chord or two and handed it back saying it was unplayable. I can't swear to it but I think Groucho said he gave the guitar away to somebody the next day.

Murray