Television:
Star Trek

DeForest Kelley: "What am I, a doctor, or a moon shuttle conductor?" (The Corbomite Maneuver)

Liam Sullivan as Parmen: “What is your prognosis, Doctor?”

Kelley: “I’ll let you know when I have the results.” (Plato's Stepchildren)

Nimoy: “Dr. McCoy, you may yet cure the common cold.” (Plato's Stepchildren)

DeForest Kelley as McCoy: "By golly, Jim, I'm beginning to think I can cure a rainy day!" (The Devil in the Dark)

DeForest Kelley: "I'm a doctor, not a bricklayer!" (The Devil in the Dark)

DeForest Kelley as McCoy: "I don't know, Jim, this is a big ship. I'm just a country doctor." (The Alternative Factor)

DeForest Kelley: "I'm a surgeon, not a psychiatrist." (The City on the Edge of Forever)

DeForest Kelley: "I am Leonard McCoy... chief medical officer aboard the U.S.S. Enterprise." (The City on the Edge of Forever)

DeForest Kelley: "I'm a doctor, not an engineer." (Mirror, Mirror)

DeForest Kelley: "I'm a doctor, not a mechanic." (The Doomsday Machine)

DeForest Kelley: "I'm a doctor, not an escalator! Spock, give me a hand!" (Friday's Child)

DeForest Kelley: "I'm not a magician, Spock, just an ol' country doctor." (The Deadly Years)

DeForest Kelley as McCoy: "I will not peddle flesh! I'm a physician!" (Return to Tomorrow)

DeForest Kelley: "My name is McCoy. I'm a doctor." (Spectre of the Gun)

DeForest Kelley as McCoy: "I'm a doctor, not a coal miner." (The Empath)

Medley of all five "I'm a doctors" by DeForest Kelley.

William Shatner as Captain James T. Kirk: "Are you a doctor, or aren't you?" (Amok Time)