A blonde wanted to sell her old car, but nobody wished to buy a car with 250,000 miles on it. So, she tells her brunette girlfriend at the salon about her problem, and the brunette suggests she take the car to a mechanic friend of hers, who will turn the meter back by 200,000 miles.

The blonde thinks this is a sound suggestion and does so.

About a month later, the brunette sees her blonde girlfriend in a store and says, "Did you ever sell your car?"

"No," says the blonde. "Why should I? It's only got 50,000 miles on it."