The Black Museum - The Open End Wrench

A motorist, going at a normal speed, enjoying the fresh sunlight, green fields, and rising hills, notices the road curved ahead and the light posts that mark the edge of the embankment. As he slowed down to navigate the road, he notices a broken guardrail fence. He stops his car to take a look over the edge. Suddenly, he sees a car at the bottom of the embankment. He jumps back into his car and begins speeding toward the nearest town, toward the nearest police station. Once there, he tells the Constable "There is a wreck on the curve about a mile south of here!" The Constable asks "Did you have anything to do with it, Sir?" The motorist says "No, of course not. I noticed the broken fence and saw the car down the hill. There seemed to be a woman in it. You'd better come, and bring some help!".