Joseph Mantell (born December 21, 1920) is an American actor. He was nominated for an Academy Award for Best Supporting Actor for his role as "Angie" in the 1955 film Marty, which earned the Best Picture Award, and the Best Actor Oscar for Mantell's co-star, Ernest Borgnine.
Mantell also appeared in Storm Center (1956) and Chinatown (1974). In the latter he played Lawrence Walsh, partner of private eye Jake Gittes, and the agency's primary photographer. He delivered the film's famous last line, "Forget it, Jake, it's Chinatown."
Mantell is also the first actor to deliver the famous lines "You talkin' to me? You talkin' to me?" while facing a mirror. Most people know these lines from the film Taxi Driver but they first appeared in Mantell's tour de force performance in Episode 039 of The Twilight Zone. Mantell played John "Jackie" Rhoades a two-bit crook who is ordered by his crime boss to murder for the first time. Jackie confronts his better self in the mirror who begins talking to him. Jackie's response was the famous lines written by Rod Serling.
Jackie: "You talkin' to me? You talkin' to me? Oh yeah. Yeah, sure you are. Now me and the mirror we're havin' a talk. I've had it huh?. All my marbles are gone. This is how it happens."