They call it "ghetto ear"

Det här är fint; Rory ska flytta in hos Paris och Doyle i deras lägenhet som ligger i ett gangsterkvarter och får följande förmaningar.

Paris: This neighborhood is only as scary as you make it. Those guys downstairs, they just look deadly. Believe me. They don't bother you if you don't bother them. When you have guests over, just tell them they're a doo-wop group.
... (smällande ljud)
Rory: Oh, my God! Were those gunshots?
Paris: No. That was just a car backfiring. The real gunfire actually sounds fake. You'll pick it up eventuallly. They call it "ghetto ear".
Rory: Something to look forward to.