But anyone who has seen any of this movie's uplifting-but-so-sad prototypes -- be it "The Fisher King" or "Awakenings" or any of a dozen other movies preaching a sermon of love, peace and harmony and indulgence of weirdos -- will already know the answer.
There are obvious ties to "Starman" (starring, coincidentally, Jeff Bridges as the visitor from another planet) for the space alien perspective and films like "Awakenings" and "One Flew Over the Cuckoo's Nest" for the psychiatric institution viewpoint.
Toss in a little Awakenings, a little Starman (including Jeff Bridges--not the spaceman this time), and a little Hollywood preachiness, and you've got yourself K-PAX.
Countless benign alien, doctor/patient, fish-out-of-water and asylum movies all come to mind: "One Flew Over the Cuckoo's Nest," "Awakenings," "City of Angels," "The Muse," "E.T.," "Starman" and far too many others to list.
The film superficially resembles the well-regarded 1987 foreign film "Man Facing Southeast," but its similarities to "One Flew Over the Cuckoo's Nest," "The Fisher King" and "Awakenings" run deeper, though those were all much better movies than this one.
After the director's last film - the clinical, emotionally eviscerating trauma of "The Wings of a Dove" - it's as if he has decided to go to the other extreme, presenting a naive, touchy-feely fable, a blend of "Starman" and "One Flew Over the Cuckoo's Nest", by way of "Awakenings".