Leonardo DiCaprio made a surprise appearance during a talk between Robert De Niro and Martin Scorsese at the Beacon Theatre on Sunday as part of the Tribeca Film Festival.

After playing a clip from “The Wolf of Wall Street,” De Niro and Scorsese discussed how the famed director first came to work with now-longtime-collaborator DiCaprio. As it turned out, De Niro encouraged Scorsese to meet him after being impressed with the then-young actor while working on 1993’s “This Boy’s Life.”

“He’s really good, this kid,” De Niro recalled saying. “And that was it!”

Scorsese then called out from the stage to Leo, who had secretly been sitting in the audience. Clad in his signature baseball hat and a black jacket, an in-disguise DiCaprio stood and waved to the audience and stars onstage.

He received a round of applause but didn’t participate in the talk.