Quote from Debra in Crazy Chin
Debra: I always thought that that chin thing was just a nervous habit. Amy: Well, what did he have to be nervous about last night? We were having dinner with my family. Oh. Debra: By the way, it's not just your family that stresses him out. Ray: What, all of a sudden, you got a problem with my family? Debra: All I'm saying is that Robert Barone has plenty of reasons to develop a nervous habit or two. I mean, on top of everything else, he's a policeman. The chin thing is clearly a manifestation of stress. [off Ray's look] What? I took behavioral psychology in college.