The Janitor is a character on Scrubs played by Neil Flynn.  His real name is unknown and he is simply referred to as the Janitor on the show.  He is constantly lying and torments J.D. every day.

The Janitor Quotes

# Dr. Cox: I am getting rid of Maddox. Who's in?
Janitor: I'm in. Ever since she fired me I've been moping around my apartment making barking sounds. I'm not crazy, I just need some human interaction and the barking makes the neighbors yell 'shut that damn thing up'. Then I can go over there with a bottle of scotch and apologize for Rusty, my imaginary echida. The only downside is that by the time Lady, my girlfriend, gets home, I'm too drunk to talk to her, much less make love. You've never pictured me as an organism that has sex, have you?
Dr. Cox: We have not, no.

Dr. Cox: How are we going to get rid of Maddox? Janitor, would you like to get your useless ideas out of the way first?
Janitor: Well thank you Perry. Off the top of my head I'd go reindeer stampede, astronaut attack, barbed wire chandelier, photoshop, poisonous sushi

Scrubs Quotes

J.D.'s Thoughts: Wait, is she in to me? Quick, make a bad joke and see if she laughs.
J.D.: Did you hear the one about the skeleton who couldn't go to the party? He had no body to go with.
Neena: That's really funny!
J.D.'s Narration: Well that's not a fair test - that joke's hilarious.

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?