A blond, a brunette, and a redhead walk into a store.

The woman behind the counter looks them over and asks, "Do you girls want to see something?"

Confused they say yes.

The woman pulls out a ceramic pot from behind the counter, and says, "If you stick your head in this pot and say something you think is true, but it is not true you will disapear off the face of the Earth, POOF! But if what you say is true, the pot will turn to gold and it is yours to keep."

The redhead sticks her head in the pot and wispers, "I think I am the smartest girl in the world." And POOF! she disapears.

The brunette sticks her head in the pot and says, "I think I am the most beautiful girl in the world." And POOF! she disapears.

Then the blond sticks her head in the pot and says, "I think..." And POOF! she disapears.