John Krasinski's movie "IF" is full of A-list celebs who stepped in to voice characters. Emily Blunt, Steve Carell and Matt Damon are just a couple actors whose voices you'll recognize.

The anticipation for IF is real, and Krasinski sat down with Jimmy Fallon on The Tonight Show to talk about the project. He chatted about some of his inspirations for the film, as well as what it was work with stars like Bradley Cooper,

Actor-filmmaker John Krasinski shared how he managed to get major stars to sign onto the project, IF. During his appearance on Jimmy Fallon’s talk show, he shared, “I got to say, the most yeses of my career was on this movie and the fastest yeses because they all love the idea of imagination,