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. [to Cox]: you won't admit this, but you're in love with Carla.
Carla: No, he's not.
Dr. Cox: Actually, I am.
Carla: You're starting again.
J.D.: And Carla, you're mad that Turk didn't trust you enough to tell you.
Turk: See? Trust, woman, trust!
J.D.: Whatever. The point is that Turk is sorry.
Turk: Not anymore!
Carla: I can't believe you thought he was a threat.
Dr. Cox: I'm a threat!
Carla: You're not in love with me, you idealize me.
J.D.: Can we just try and stay focused...
Turk: You're mad 'cause I'm scared of losing you?
Carla: Yes, because we're stronger than that!
Dr. Cox: Apparently not!

Dr. Cox: Dodging a funeral? Nice!
Turk: Excuse me?
Dr. Cox: Just a veteran move from the baby face sophomore. The whole "I'm sorry for your loss" thing was a little Hallmarky for me but darnit all, if you're not showing just a ton of promise.

Scrubs Quotes

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?

I understand that you took a cab all the way down here - that doesn't mean that I can give you Vicodin because your teeth are itchy