i think you are referring to the ghost story where the husband and wife in a car that broke down at night. the husband went to search for help and asked the wife not to go anywhere. a few moment after the husband gone, the wife heard a thud on the roof. then nothing else. after that a police car came and ask the wife to step out of the car, never looking back.

but she did.

and what she saw? something devouring her husband on the car roof:D