Diagnosis Dodgy

Not “off the cuff” today, more like “off the bicycle-clips”. Thanks Roland.
An elderly man went to see his doctor.
Elderly man: “Doctor I have a pain in my left leg”
Doctor: “Well let me look at it for you and we’ll see what seems to be the trouble, hmm… I think I know what the trouble is, just as I thought – just part of growing old!”
Elderly man: [in a raised voice] “Can’t be doctor! Just can’t be!”
Doctor: “I’m sorry, but I’m afraid that is what’s wrong with it, are you questioning my diagnosis?”
Elderly man: “But doctor, there’s nothing wrong with my other leg and it’s exactly the same age!”