I love McCoy as the cantankerous ship surgeon on the infamous five year mission of the USS Enterprise not because of his likability or valour in the face of danger, but the fact that space was his greatest enemy. He hated the transporter and the troubles that were inherent to the extensive use of technology surrounding him. While being an exceptional friend to Captain Kirk from their college years in Starfleet Academy, McCoy somehow remained a simple southern boy (not unlike Kelley's true Georgian roots) in a fast-paced future reality. He had simple pleasures (from what I understand, mostly liquor) and a love of beautiful women (who somehow preferred Mr. Spock over him, consistently, through three seasons of the show). His griping about everything that made him angry was a true show of his passion, a quality which constantly reminded the good Captain of the human factor inherent to any mission or conundrum the crew faced.
It's easy for actors in iconic roles to remain immortalized in their feature role, but real fans of his know he can be found in 20 years worth of cowboy shoot 'em ups of the 1940's and 1950's before he ever stepped foot onto a spaceship.
DeForest Kelley's southern drawl somehow always emerged in his character, despite his best efforts to iron it out during his early days in Hollywood. My favourite Star Trek game to play is listening to which vowels Dr. McCoy let's go limp through the course of an episode, letting a "y'ahll" or "dahmn" slip out. Truly a guilty genteel smile shines from his face every time.
It would be Mr. Kelley's 90th birthday.
[/The End <3]