Goldfish

3 blondes caught a goldfish, and the fish said if they let her go she will grant them one wish each. The first blonde said: "I want to be smart." The second said: "I want to be smarter than her," and the third said: "I want to be the smartest." In the morning they woke up and the first blonde turned into a brunette, second black and the third one had become a man.