In a new clip from Clooney's appearance on the former late-night host's Netflix show, My Next Guest Needs No Introduction With David Letterman, the duo enjoys burgers and fries at the parking lot of an In-N-Out Burger, where they talk about their interest in airplanes. They're then briefly interrupted by an In-N-Out worker named Travis, who brings them chocolate milkshakes.
"Are you with the restaurant?" Letterman deadpans.
As Travis walks away after a pleasant exchange, Letterman can't help but tease Clooney.
"I notice you didn't dig down to give the guy a gratuity," he cracks.
In a previous clip from the episode -- which streams Friday, Feb. 9 at 12:01 a.m. PT on Netflix -- Letterman again gives Clooney a hard time, this time when it came to how the actor met his wife, Amal. Clooney revealed that Amal actually came over to his house for their first meeting, and that he didn't know if she wanted to go out with him.
"Who would, George?" Letterman replies. "Let's be frank, who would really want to go out with you?"