Monsters, Inc. (2001)

In order to power the city, monsters have to scare children so that they scream. However, the children are toxic to the monsters, and after a child gets through, two monsters realize things may not be what they think.
 
Directors: Pete Docter, David Silverman (co-director)
Writers:   Pete Docter (original story by), Jill Culton 
Stars:   Billy Crystal, John Goodman, Mary Gibbs