A man goes to the doctors and says, "Doctor, I've got this
problem, only you've got to promise not to laugh."
The doctor replies, "Of course I won't laugh, that would be
thoroughly unprofessional. In over 20 years of being a doctor I've
never laughed at a patient." "OK then," says the man, and he drops
his trousers.
The doctor is greeted by the sight of the tiniest penis he has ever
seen in his life. Unable to control himself, he falls about
laughing on the floor. Ten minutes later he is able to struggle up
to his feet and wipe the tears from his eyes. "I'm so sorry," he
says to the patient, "I don't know what came over me. I won't let
it happen again. Now what seems to be the problem?" The man looks
up at the doctor sadly and says, "It's swollen."