Shut up, Patti LuPone! Shut your brassy magnificent trap! I don't wanna hear you sing. I don't wanna cut your hair. And I certainly don't wanna hear you singing while I'm cutting your hair. Got it? Now I'm talking to my best friend, so stand back, Buenos Aires.
Patti LuPone was trying to get Jack's attention to ask him if she could sing in the restaurant but Jack just wants to listen to Will talk about his problems.