At a dinner the other day with an audience of eminent medical types, I was regaling people with my tale of falling out with medicine on the grounds that I (a) don't like sick people and (b) don't like any of the stuff that comes out of even healthy people. Anyway, it seems universal that the medical professions' least favourite human fluid is sputum. I really need to find different dinner company.
(Also, if you're planning to photograph that strange rash on your knob with your phone to show your GP without dropping your trousers (they're still going to need you to do it), make sure all photo-sharing options are off before doing so otherwise you're destined to become an anecdote.)