Coster-Waldau, who plays Jaime Lannister on Game of Thrones, is pivoting to a more comic role in The Other Woman that involves its fair share of potty humor. But Coster-Waldau is more of a fan of The Other Woman's raunchy humor than you might expect the man behind Jaime Lannister to be.
"Fart jokes still work for me," Coster-Waldau says. The devoted dad of two loves to embarrass his daughters, 10 and 13, with distinctly low-brow comedic routines: "The older they get the easier it is … I like to be at a restaurant and show my mouth when I eat … Or sing in public, because I don't sing very well, and even if I did it would still be embarrassing. There's so many things you can do to mess with them."
PEOPLE's Blaine Zuckerman sat down with Coster-Waldau to see how well the star knows his own work: Watch him try to recall the number of swords that went into the Iron Throne. (Though he does remember the Lannister House motto pretty handily.)
Reporting by BLAINE ZUCKERMAN