The hunch-backed man decided very reluctantly, that he should go see a doctor.   A few too many people have started to comment on his back.

Doctor: "I need for you to get undressed, sir.       
(Hunchback removes jacket and then stops)     

Hunchback:  "I really don't like getting undressed, doctor."

Doctor:  "If you want me to examine your back, you'll have to get undressed. 
(Hunchback removes his shirt but leaves his t-shirt on.) 

Hunchback:  "I don't like showing people my back.  They always laugh at me."

Doctor:  "Do you want me to examine your back or not?" 
(Very reluctantly, the hunchback removes his t-shirt.) 

Doctor:  "Ah...just how long is it since you were in school?"

Hunchback:  "Gosh, over 20 years, Doctor.  Why?

Doctor:  "Did you ever wonder all those years what happened to your backpack?"