A scene in this documentary question

It happens very late in the documentary, which I found quite interesting, seeing clips from random slasher movies, some which were very gross, but always intriging, um but anyway, there's one clip they show where it's a girl in a car with a gun. It shows her putting the gun in her mouth, and then pulling the trigger. Then the next shot is the back windshield, splattered in blood. Does anybody know what movie's that from? It seems kinda recent, but nobody seemed to reference it.