"Life changed pretty drastically on that day. I actually found out I was going to be a father that morning," Miranda recently told ET's Kevin Frazier at a junket promoting Moana. "My wife was going off on a business trip and I was still asleep, she had to catch an early flight, and she said, 'Hey I think you might be a dad, alright, I'll see you later!' And I was like, 'Great!... What?'"
"I called her when I fully woke up to confirm what she'd said and then I got the call about Disney later that afternoon," he added.
The 36-year-old Pulitzer Prize-winning star explained that the offer from Disney came with a plane ticket to New Zealand, where the film's creative department was attending a musical festival featuring local and traditional artists. So he was soon on a flight to New Zealand.
"I'm flying 18 hours and I've got this secret of 'I'm going to be a dad,'" Miranda recalled. "So it was really one of those life changing weeks."
Miranda and his wife, Vanessa Nadal, welcomed their son, Sebastian, in November 2014. Two years after he was born, Moana is going to be the first movie he watches in theaters.
"I don't think this is a movie you can wait till it gets to video [to see]," Miranda explained. "I think the ocean is so incredible and the effects are so incredible, I really want him to see it on the big screen."