Movies don't follow real world logic. If they did, there wouldn't be nearly as much conflict, or maybe because the audience wouldn't understand what's going on. Still, we have to wonder why the same stupid things happen in movie after movie.
Cracked readers explain that different pop culture logic in charts and graphs, with 19 of them rising to the top. Some concern particular movies or genres, some are even specific to a TV show, because those are made in Hollywood, too.