Doctor Christopher Duncan Turk, who's mostly known as just Turk, is played by Donald Faison and is J.D.'s best friend on Scrubs.  He is a surgeon at Sacred Heart and quickly dates and marries one of the nurses there, Carla Espinosa.  He and Carla then have a baby Isabella together.

Turk loves to dance and is definitely one of the best surgeons and makes it well known.  His man love with J.D. is one of the best parts of the show.

Turk Quotes

J.D.: Anyway, about this whole setting the date thing: I mean, I'm really psyched for you guys, it's just gonna be harder and harder for us to hang out, you know? I mean, you're gonna be married, man! You're gonna have, like, a house! You know? You're gonna be spending your weekends chasing around little Arturo and Rosaria!
Turk: You mean Tamika and Fuquan?
J.D.: You should... talk to Carla...

J.D.: Look the point is, think of the millions of times you chose to not to hang out with your wife, 'cause you were trying to hang out with me. You know, maybe it's time you started acting like a real husband, instead of acting like some sort of crazy... cowboy.
Turk: A cowboy?
J.D.: I don't know, it just came to me.

Scrubs Quotes

Turk: With Marbury, I really believe New York has a shot at the title, man.
J.D.: Yeah, me too.
Turk: Which sport are we talking about?
J.D.: I wanna say tennis...

J.D.: Hey, I heard a great joke. A guy walks into a dentist's office and says, "I think I'm a moth." And the dentist says, "Well, if you think you're a moth, why are you at a dentist's office?"
J.D.'s narration: Oh, no, I forgot the punchline... You can't bail out now! Stall! Stall!
J.D.: ...So the moth says "That's a good question. What kind of dentist are you?" And the dentist says, "Well, I'm a general dentist, but I...I do dabble in orthodontry - braces and such." And... and the moth says, "Orthodontry? I hear there's great money in that."
J.D.'s narration: "The light was on"!
J.D.: "But! To answer your original question, which was, if I think I'm a moth, why am I in a dentist's office? The answer is, Because the light was on!" The light! The light, James. Moths love light. So, James, other than your funny bone being broken, what seems to be the problem?