Wolf that one is a slightly modified form of an oldie but goodie
My Mum is (was?) a doctor, she told me that the same story about 20 years ago, but instead of a corpse it was the slighly more believable story involving the taste of sugar in the urine of a diabities patient, the fingers switch the same..she told the story as happened to her when she was a Medical Student in the early 60's.
Unfortuantly she has alzheimer's now, doesn't know my or her name, hasn't uttered a word in four years, can't get out of her chair.
Hope I don't jinx the humor thread with that reality, but thanks for making me remember her telling me the story