There's a great story about a woman who called the AA to help when her car wouldn't start after she'd topped up the oil. She'd filled it up. I mean really filled it right up, to the brim with oil. The starter had no chance of turning the engine over, must have cost her a fortune in oil. How many bottles do you have to buy before the guy in Halfords asks what you're up to or what size engine you have?
There must be just as many stories about stupid things guys have done in cars though.
My favourite(and true) story is the women who went to my local parts store, her beloved had asked her to get him a head gasket for the family car.
Anyway she bought the gasket and then as she was walking out the store, folded it in half so it would fit in her bag!!!