[carapace]

Did you hear about the man who believed he was dead? His doctor tried everything but couldn't convince him he wasn't a corpse. Finally, in exasperation, the doctor says, "Look, corpses don't bleed right?"

The man agrees, "Yeah, corpses don't bleed."

The doctor pokes him in the arm with a needle and blood wells up.

The man looks at his bleeding arm in astonishment and says, "I'll be damned! Corpses do bleed!"

(This is a true story. I think it's in "The Man Who Mistook His Wife for a Hat" IIRC.)