The Magic Mirror

A blond, a brunette, and a redhead walked into a bar. The bartender told them there was a magic mirror in the bathroom. He said that if you spoke the truth in front of the mirror, you would have your greatest desires, but if you told a lie, you would disappear.

The redhead said that she was the prettiest girl in the bar, and she walked out of the bathroom, and she got a thousand dollars. The brunette walked in and said she was the smartest one in the bar. She walked out of the bar with a new car. The blonde went in, she said, "I think..." poof, she was gone.