The aforementioned machine-gun cliche is the one that always gets me. You wouldn't want to meet some in an alley or anywhere else, but they're always dating or marrying supermodels. Money and fame talk. You also wonder why a model-type guy would date a plain woman. And vice versa.
Most people choose beauty over brains or intelligence all the time.
People want to pass on the best genes to the next generation. Never measure the height of a mountain until you have reached the top. Then you will see how low it was. It's as if most characters in them have never seen one and fall into one stupid trap after the next and always get killed in the same place and in the same manner. Most of them deserve their fate.