David Letterman auditioned for Airplane! and all he got was an acting lesson
In his Airplane audition, David Letterman taught David Zucker, Jim Abrahams, and Jerry Zucker that he “can’t act”

Before becoming king of a weird late-night comedy, David Letterman was another comic looking for a break. But Letterman knew his strengths and weaknesses and didn’t see himself as an actor. Unfortunately for him, after David Zucker, Jim Abrahams, and Jerry Zucker (ZAZ) saw him at the Comedy Store in Los Angeles, they thought he might make a good lead for their upcoming movie Airplane! The rest, as they say, is history: Letterman didn’t get the part.
In an excerpt from the new oral history of Airplane!, entitled Surely You Can’t Be Serious [via EW], compiled from interviews conducted by former A.V. Club contributor and Random Roles stalwart Will Harris, the writer/directors and Letterman finally fess up to what happened.
“They were really nice to consider me for a film because I can see where people would think, ‘Oh, we have a thing where we’re opening an Alpha Beta [supermarket]; can you come out and talk to the bag boys?’ That made sense,” Letterman said. “But a movie? And the guy who produced it was Howard Koch, who had a legitimate movie career and big-time credits. He was somebody that even I was aware of, and so I thought, Geez, he’s not gonna want anything to do with me!”
Letterman wasn’t just up for any role. He was up for the lead: Ted Striker, which eventually went to Robert Hayes. Still, Jerry Zucker knew “he wasn’t an actor, but he was funny” and he “looked great onscreen.” However, the “whole idea of acting” was anathema to Letterman. “I think it all seems too phony to him like he’s bullshitting,” Zucker said. “It just wasn’t him.” Apparently, that came through in the audition.