Apocalypse Now
During High-School, I would sometimes rent several films and then watch them essentially consecutively over the course of a weekend. This was one of those movies. At the time actually, I watched this as I packed for a trip I was going on the next day. The packing quickly stopped though, and I was completely drawn in the brilliance of the execution of this film. The dawn helicopter assault, the mad depravity of the Playboy Bunny USO show, and being stalked in the jungle by a tiger. Just amazing. Very, very highly recommended.