Ryan Gosling has said his part in The Nice Guys as inept private detective Holland March is a "what not to do" guide to fatherhood.
The actor, whose second daughter with the actress Eva Mendes was born last month, is on-screen father to Holly March, played by Angourie Rice.
Speaking at the film's UK premiere, he said: "It's basically a what not to do guide. It basically became more of a mother-son relationship than it really was father-daughter."
Holly tries to keep her father on the straight and narrow and stop him making a fool of himself.
But Ryan's character ends up in above his head as he teams up with hard-edged enforcer Jackson Healy, played by Russell Crowe.
The thriller-comedy, set in Los Angeles in 1977, sees the unlikely duo team up to investigate the apparent suicide of a young porn star.
Gladiator star Russell and The Notebook's Ryan are better known as "straight" actors, but The Nice Guys sees them show off their comic skills.
Ryan said: "I think they cast us not because we're funny, but because we're not funny, and that's funny.
"We're in such ridiculous situations in this movie, and it's so much fun, it's so silly, that I knew it would work because I know that Russell, he doesn't really do anything that doesn't work."
On working with Russell, Ryan joked: "Try not to look him in the eye because he takes it as a sign of aggression."
But he added: "No, we were having a great time, we were having a laugh."
The two first meet in the movie when Russell's character breaks Ryan's character's arm.
Russell said: "Did I enjoy the unabashed violence of the character? It's all for the gags, mate.
"There's a certain brutality that comes with shooting a movie like this, because all of the stunts are actually physically shot.
"People are getting used to that CGI where the stunts and the explosions and stuff are more than 50% cartoon. They're just drawn.
"When, in this movie, if a car goes through a house, that was a car, and until recently that was a house. And that's why it's hitting people so hard.
"So that brutality is by design."
The Nice Guys is in cinemas from June 3.