I love the opening to 'Once Upon A Time in the West'. As with all Sergio Leone films there are very few words and everything is done with looks, stares, squints, glares and camera angles.
The first time Star Wars was on TV I taped it (we rented a very early video recorder for a while) and I watched at least once a day, every day for months - I was completely obsessed!!!
also the opening few minutes of Swordfish, A Fistful Of Dollars, Close Encounters Of the Third Kind, Bullitt, The Great Escape and The Magnificent Seven ( and yes......Steve Mcqueen is one of my favourite actors......lol )