J.D.: If it wasn't funny, why did they all laugh?
Janitor: Wake up and smell the third-floor urinal I haven't cleaned in four years! Everybody kisses the ass of the person above them.
Dr. Kelso: I was going to be a cardiologist, but I didn't have the heart. [Dr. Johnson laughs]
Dr. Johnson: I was going to be a psychiatrist, but I was a-Freud. [Nurse Roberts laughs]
Nurse Roberts: I was gonna be a doctor, but I didn't have the patients. [cafeteria lady laughs]
Cafeteria Lady: I was gonna be a baker, but I couldn't raise the dough. [homeless man laughs]
Homeless man: That's funny. You know, I was gonna have her bring you some chicken, but it was fowl! [dog barks] I know.
Janitor: You get it now? Your relationship with your interns is a sham.
J.D.: That dog just laughed at a pun.