J.D.: OK, gang, I'll meet you up in Radiology to talk about Mr. Heath's CAT scan. His tumor's getting so big, it's starting to look like a "threemor"! [all laugh, including J.D.]
Janitor: Not funny.
J.D.: Have you been following me around all day dressed like an intern?
Janitor: Yes. And you're a terrible teacher. I'm not prepared to operate on anyone.