Robert De Niro stole his famous "You talkin' to me?" Taxi Driver movie line from rock legend Bruce Springsteen.
The line, which De Niro's character recites to himself in the 1976 Martin Scorsese movie, has become one of the most famous movie quotes of all time.
And the acting legend has confessed it was inspired by a trip to a Springsteen concert, while he was preparing for the role.
De Niro made the admission to Springsteen's bandmate Clarence Clemons - who coached the actor to play the saxophone for movie New York, New York.
Clemons tells the New York Daily News, "(He) had been to one of our concerts and the audience was yelling out 'Bruce!' In those days, Bruce would stop onstage and say, 'You talkin' to me?'
"De Niro was kind of channeling him."