Screaming.
Maybe I'm just a chauvinist at heart, but it really bothers me to the point of great annoyance when women scream all the time in movies. Don't get me wrong, there are places when screaming is appropriate, and then there are places where the screaming is excessive and just irritating as all hell.
If you are being attacked and you are trying to find help, screaming is great. If it's obvious that screaming will not bring help, STOP SCREAMING and do something more useful like thinking about how you can get yourself out of your situation.
I'm sure many horror directors feel that screaming females bring out the terror, with the additional bonus of making the men watching feel more manly as they think to themselves, "It's not what I'D do. I would do this. Silly ladies, always so weak. Hurr durr..."
Call me crazy, but somehow I just expect women to be more self-reliant and resourceful, ESPECIALLY if the situation calls for it.