One Riverdale diner got a very unexpected customer last week.

Actor and comedian Jerry Seinfeld made an unscheduled appearance at the Shortstop Diner on Thursday.

Seinfeld and fellow comedian Amy Schumer were shooting the latest episode of the unscripted hit web series, "Comedians in Cars Getting Coffee." Each episode focuses on Seinfeld driving around and stopping at local diners, all while interviewing a fellow comedian.

The show was scheduled to stop at a place in Westchester, but the car the comedians were riding in had some trouble. Seinfeld ended up shooting the episode inside the Bronx diner, where he autographed menus and took some photos.

The episode is set to air sometime this fall.