Keith Dudemeister is one the of medical residents at Sacred Heart that begins a booty call with Elliot that quickly turns into a relationship.  Eventually Keith moves in with Elliot, proposes wto her, only to have her break off the engagement, ruining the poor guy's life.

Keith Dudemeister Quotes

Laverne: Has anybody seen Johnny, the tackling Alzheimer's patient?
J.D.: Hey! You must be Keith.
Keith: Uh, heh.
J.D.: Don't look so nervous, buddy. I got your back.
Johnny: (Tackling J.D.) WHO AM I?!
J.D.: Whaaaagggghhh!
Laverne: I found him.

J.D.: Hey, Keith! I just called upstairs to see how Mr. Kellerman was doing? And get this - the nurse told me you never even started him on a Lasix drip. And Lisa! Imagine my surprise when she told me you never even increased his diuretic in the first place! I'm forced to ask, are you people trained killers? Say something, Keith!
Keith: Uh... I... eh... uh...
Jason: Dr. Dorian, if he gets bad enough and we have to put him on inotropes, he'll jump to the top of the transplant list and get a new heart.
J.D.'s Narration: They're messing up on purpose?

Scrubs Quotes

Janitor: Aww, either your picture didn't come out, or we got a hospital full of vampire doctors.
J.D.'s Narration: Vampire doctors? How did he hear about my screenplay?

On advertisement
Girl: Mommy? When's daddy coming home?
Mother: He isn't. If only he'd loved us enough to get a full body scan at Sacred Heart!