It's late. It's dark. The only light falling on your face is comes from a cinema screen in front of you. The image is that of jungle. You almost nod off. Five minutes later, you take a long hard look at the screen and keep looking for about a minute. It's still jungle. After about half an hour of this, you realize that Aguirre, the Wrath of God will be jungle. It will always be jungle. It will be jungle for two irreplaceable hours of your life.
That's about the time you should leave the theatre.