Lord Love a Duck was a 1966 movie starring Roddy McDowall and Tuesday Weld. I've never seen the movie, but fans claim that it's top-shelf, part of the creme de la creme of 60s black comedies (Dr. Strangelove, et al), and features McDowall's greatest performance (apparently outstripping his scenery-chewing Dr. Cornelius in Planet of the Apes).

The plot, as written and directed by George Axelrod (who penned the filmscripts for The Manchurian Candidate and Breakfast at Tiffany's), involves a guru-esque high-school student who moves in and devotes himself to making the vapid dreams of a beautiful classmate come true, at the expense of everyone else's sanity (including his own). Truly hilarious, I'm sure.