VIDEO: Josh Gad Recalls Actor's Worst Nightmare During BOOK OF MORMON Performance

On last night's LATE LATE NIGHT, Broadway veteran Josh Gad recalled one of his worst nightmares from performing live theater. He explains, "I was doing BOOK OF MORMON and I was like a year in and I started forgetting lines. And I would paste the lines in an actual 'Book of Mormon.' And one night I took the wrong book out." Realizing he was in trouble, he remembered thinking, "Oh God what have I done?", adding that audience members began screaming the lines at him!

Below, check out clips from last night's show, featuring Gad, CRAZY EX-GIRLFRIEND's Rachel Bloom and Michelle Dockery, who will soon star opposite Bryan Cranston in a London stage adaptation of NETWORK.

Each week night, James Corden invites the audience to join in on the fun as the Emmy Award-nominated THE LATE LATE SHOW WITH JAMES CORDEN features a mix of celebrity guests, musical acts, games and sketches. Corden differentiates his show by giving a peek behind-the-scenes into the green room, bringing all of his guests out at once and lending his musical and acting talents to various sketches. Additionally, bandleader Reggie Watts and the house band provide Corden with original, improvised music throughout the show. Since Corden took the reigns as host in March 2015, the show has quickly become known for generating buzzworthy viral videos, such as Carpool Karaoke.