Listen to the sound clip How do you know, Ernie? from K-PAX: How do you know, Ernie? How do you know, Ernie? This sound is from K-PAX K-PAX is a thought-provoking and mesmerizing science fiction film released in 2001. Adapted from the novel of the same name by Gene Brewer, this movie delves into the mysterious world of a man claiming to be a visitor from a… Go to the full soundboardwith more sound clips Search