This story was going around, about a guy that asks a lady for a ride to his car in a mall parking lot.
"A lady was leaving a store and went to her car and notices that she had a flat tire. A good samaritan says he'll change the tire for her which he does. He then asks her for a lift to his car on the other side of the lot. She asked him why his car was on the other side of the lot and he said he met a friend for lunch and drove him here. When he puts the flat tire in the trunk she notices that he also puts a bag in the trunk. She gets suspicious and tells him that she forgot her credit card in the store and would he mind waiting a minute. She calls the police. When they got to her car he was gone; but in the bag in the trunk was duct tape and a butcher knife. It turns out that he let the air out of the tire.
This is a great urban legend because it has all the typical qualities of an urban legend. It has a horror theme that has a warning to helpless female victims and it has a surprise ending. There is another variation of the legend in which the killer takes on a clever disguise to trick his victim, but once again, for once, unlike in most legends, the victim doesn't become the victim after all.
A woman was driving along one night, on her way home, when she saw an elderly woman by the side of the road. She decides to pick the old woman up, despite her decision to never pick up hitchhikers when she is driving alone. Halfway through the journey, she glances at the old woman and notices that she has unusually hairy arms. Getting suspicious, the woman stops and asks the old lady to get out and check the back of the car because something may be wrong. The old woman gets out and goes to check and the woman drives away, feeling comforted and safe, but soon feeling guilty knowing that she was probably just a poor old woman. Then she feels even more guilty when she realizes she has took the old woman's bag with her. She gets home and takes the bag to the police so it can be returned, but upon investigation they discover a huge butcher knife stained with blood, hidden inside the bag.
I have also heard this story spoken by mouth, I cannot verify whether it is true or not, but it was told to me by my father and is about a woman near where he used to work.
The woman was helped out by an old man and he asks for a ride to thank him. She agrees, but then suddenly regrets her decision, knowing it was a stupid move. But he's expecting a ride now, so she tells him she only just passed her driving test, and asks him to guide her out. So he stands and watches as she backs out of her parking space, but of course, she doesn't stop, she just drives away. But feeling guilty, she takes the suitcase he left to the police to be returned, only for the police to discover a knife hidden within it.
A very popular tale, you can tell, by the fact that it has mutated into various strains as it has been spread by word of mouth.