Did you even notice in the Old Series, that Dr. McCoy
always had a snappy  comeback when anyone asked
him to do anything outside the field of medicine?
Here is a (soon to be) complete list of them.....
 
 

"I'm a Doctor, not  a bricklayer."

"What am I, a Doctor or a moon-shuttle conductor?"

"I'm a  Doctor, not an engineer."

"Well I"m a Doctor, not  a mechanic."

"I'm a Doctor, not a Coal Miner"

"I'm a Doctor, not an Escalator."

"I'm a surgon, not a Psychiatrist."

"I'm not a magician Spock....I'm just an old County Doctor."
 

 
Even Doc Holodec on Voyager has a few.......
I think they programmed him with a little of Dr. McCoy's attitude.

"I'm a Doctor Mr. Neelix, not a decorator."

"I'm a Doctor, not a bartender."

"I'm a doctor not a counter-insurgent"

"I'm a Doctor, not a database."

"I'm a doctor not a performer"

"I'm a doctor, not a dragonslayer!"

"I'm a doctor, not a battery!"

"I'm a doctor, not a peeping tom."

"I'm a doctor, not a historian."  (from DS-9)
 
 "I'm a Doctor, not a doorstop." (On the Enterprise-E)

 *Thanks to Star Trek in Sound and Vision for some of the waves.

(This list is no way near complete, and any ideas or suggestions are appriciated.
       Anyone know what eps. these came from?  Email me!)