People are going to turn around and look up
But even if you immerse yourself totally in the experience, it's easy to get to reminded that what's going on around you isn't real. All you have to do is turn around (or look up at the rafters) and you see carefully concealed emergency exits, strings of lights, security cameras, animatronic ghosts and pirates and animals repeating the same canned movements. Most rides depend on the rider keeping his or her butt in the seat (and hands safely inside the ride at all times!), facing forward, never turning to look back behind. Of course, people do turn around and look up.