The Dead Boyfriend
Here's a story my mom told to me and my friends when I was about seven years old. You can imagine I was scared to death...
A woman and her boyfriend were on their way home from somewhere (not important) one night, and suddenly his car ran out of gas. It was about one in the morning and they were completely alone in the middle of the nowhere.
The guy stepped out of the car, saying comfortingly to his girlfriend, "Don't worry, I'll be right back. I'm just going to go out for some help. Lock the doors, though."
She locked the doors and sat restlessly, waiting for her boyfriend to come back. Suddenly, she sees a shadow fall across her lap. She looks up to see... not her boyfriend, but a strange, crazed looking man. He is swinging something in his right hand.
He sticks his face close to the window and slowly pulls up his right hand. In it is her boyfriend's decapitated head, twisted horribly in pain and shock. She shuts her eyes in horror and tries to make the image go away. When she opens her eyes, the man is still there, grinning psychotically. He slowly lifts his left hand, and he is holding her boyfriend's keys... to the car.