Janitor: What's up?
J.D.: [thinking] Be careful here... Don't give him anything.
J.D.: Nothing. What. Is. Up. With. You... Man?
Janitor: I always get this way in the fall, you know - summer's gone, the days are shorter; it just makes me feel so... what's the word...
J.D.: Sad?
Janitor: Yes, that's it. I'm a janitor, so I couldn't think of the word "sad". I was gonna say, it makes me feel so "mop."
J.D.: Let me explain, I -...
Janitor: Go ahead, I'm "mopping".
J.D.: Maybe I shouldn't bother.
Janitor: Maybe you "mopn't".
and all the parts that come after this in that ep