A few of the films I've seen such a ridiculous number of times that I feel like I wrote the scripts (I know them that well)...
Once upon a Time in the West The Shining Psycho Psycho II 2001: A Space Odyssey Village of the Damned (1960) Dr. Jekyll & Mr. Hyde (1932) Inherit the Wind Bad Day at Black Rock Burnt Offerings Star Trek II: The Wrath of Khan Star Trek III: The Search for Spock Airplane! Monty Python's The Meaning of Life Monty Python and the Holy Grail Blazing Saddles Young Frankenstein High Anxiety History of the World Part I Key Largo Halloween (1978) The Fog (1980) National Lampoon's Vacation Time Bandits The Pink Panther Strikes Again Dirty Harry Sudden Impact Poltergeist Jaws Nine to Five Crimes and Misdemeanors Caddyshack Rope On Golden Pond Close Encounters of the Third Kind Batman (1989) The Thing (1982) The Witches of Eastwick