Filmmakers have plenty of tricks to manipulate a viewer's emotions or mood. Action and dialogue are fine, but they are enhanced by lighting, color, music, sound effects, ands even camera angles. The "Dutch Angle, or a tilted camera, is one of those tricks. People are pretty good at compensating for the angle of our heads, and therefore our line of sight. Most folks have no trouble laying on their side on the couch and watching TV. Our brains know where our heads are. But in a movie, we aren't able to compensate so well, because if our heads are straight up and the vision on the screen is tilted, well, it makes everything appear somewhat wrong. We have lost control of our point of view. And that's naturally unsettling.