There's a few variations of this
One of them is where a man is waiting by a car with a cracked window, woman returns, man says "Saw some yobs smash the window, chased them off and waited by the window for the owner to return" man asks for a lift home, woman declines and later finds a knife and rope under the passenger seat.
(Belgaer is, Thu 7 Feb 2008, 12:23, Reply)