"I'm a doctor, not a mechanic."
		-- "The Doomsday Machine", when asked if he had heard of
		   the idea of a doomsday machine.
"I'm a doctor, not an escalator."
		-- "Friday's Child", when asked to help the very pregnant
		   Ellen up a steep incline.
"I'm a doctor, not a bricklayer."
		-- Devil in the Dark", when asked to patch up the Horta.
"I'm a doctor, not an engineer."
		-- "Mirror, Mirror", when asked by Scotty for help in
		   Engineering aboard the ISS Enterprise.
"I'm a doctor, not a coalminer."
		-- "The Empath", on being beneath the surface of Minara 2.
"I'm a surgeon, not a psychiatrist."
		-- "City on the Edge of Forever", on Edith Keeler's remark
		   that Kirk talked strangely.
"I'm no magician, Spock, just an old country doctor."
		-- "The Deadly Years", to Spock while trying to cure the
		   aging effects of the rogue comet near Gamma Hydra 4.
"What am I, a doctor or a moonshuttle conductor?"
		-- "The Corbomite Maneuver", when Kirk rushed off from a
		   physical exam to answer the alert.