Colin Farrell was never much of a theater kid.

“I was too busy kicking a football around until my mid-teens,” says the Irish actor, who is the son of professional footballer Eamon Farrell. But in new movie “A Big Bold Beautiful Journey” (in theaters Sept. 19), Farrell gets a chance to flex his pipes as David, who goes on a surreal odyssey through his memories with the defiantly single Sarah (Margot Robbie), whom he meets at a wedding.

In one memorable sequence, David is whisked back to his 15-year-old self in high school, where he’s the star of the musical “How to Succeed in Business Without Really Trying.” The “In Bruges” star croons and soft-shoes alongside a teenage cast, before he and Robbie lead the entire audience in a sing-along of “Been a Long Day.”

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“It was so fun,” Robbie recalls. “I was positively gleeful watching Colin do his little jazz hands and jazz feet. It was great.”