Frank Costello: "I wonder what they do in that particular department, anyway." [Costello slams on Costigan's broken arm with Costigan's boot] Frank Costello: [yelling] "Are you still a cop?" Billy Costigan: [in severe pain] "No!" [Costello whacks his arm again] Frank Costello: [yelling] "Swear on your mother's grave you're still not a cop?" Billy Costigan: [painfully] "I'm not a fucking cop!" [Costello whacks his arm again, this time re-breaking it] Frank Costello: [yelling] "Are you going to stop doing coke deals with your jerk-off fucking cousin?" Billy Costigan: [weakly] "Yes, yes, yes!"

Frank is trying to find out who's side Billy is on