Ben Miller cast Noel Clarke in his new film - after getting stuck with the actor in a lift.
The comedian, 45, famous for his partnership with Alexander Armstrong, is making his directorial film debut with Huge.
The buddy comedy stars Adulthood's Noel and London To Brighton's Johnny Harris as two aspiring comedians who set out to become a famous double act.
Ben said of his stars: "These are two people that you don't perhaps think of as being comedy actors. But I knew they were both funny.
"I was stuck in a lift with Noel once and he was with some friends and was really making them laugh. I thought, 'Perfect'."
Ben said he drew on his own experience of being in a double-act, famous for the Armstrong And Miller Show, to make the film.
"There's been a lot of storming out, especially when we were younger, but you get used to compromising."
He added: "The story of the film is that the friendship has to come first.
"That's definitely true with our double act. I think one of the reasons we've stayed together so long is that we really, really get on."
:: Huge is released in cinemas on Friday, July 8