How dumb can you be?

I had to laugh at the idiocy of some people that act in scary movies when someone is after them. Like for instance the friend that ran down to the basement of the hotel to get away from the killer.. Like, she runs away REALLY fast to get away from him but looks behind her the whole time so she trips over the 50 paint tins that are on the ground, making the biggest noise ever and alerting the killer. And the guy that goes up to get his gf and thinks that she locked herself in the bathroom and doesnt want to talk to him and then he goes and sits on the couch with his back to the bathroom and talks to her like shes there. Wouldnt he think its just a LITTLE strange that she doesnt reply. Surely if shes angry she would yell at him to shutup or just say something. Just something that frustrated me.