Greatest movie of all time is a hard choice to make. I mean, you have Pulp Fiction, The Exorcist, One Flew Ove The Cukoo's Nest, Apocalypse Now, Taxi Driver, The Godfather, Citizen Kane, A Clockwork Orange, Full Metal Jacket, 2001 A Space Odyssey, Halloween and so many others. If I had to say, I'm just going to put down Woodstock because it's probably one of the greatest moments of human compassion caught on film.