Krasinski revealed on Jimmy Kimmel Live that he was also one of the monsters terrorizing the family. He already knew how he wanted the creatures to move, he said, so it was suggested that he put on the suit to demonstrate. “Nobody knows about it because I’ve kept it quiet,” he said, making a sweet pun on the film's title.
Krasinski's turn as the monster was not by choice. The box office hit was filmed on a low-budget and Krasinski joked about going through Halloween stores in Brooklyn in search of monster costumes. Thankfully, the production went with CGI instead.
When Jimmy Kimmel showed a photo of Krasinski in the motion capture suit, the actor was embarrassed. “This is gonna end my career,” he joked.
Watch the full interview, below.