There was a red head, a brunette, and a blonde standing in front of the trust mirror.  They had to stand in front of it and tell the truth of what they thought otherwise they would Puff and dissapear forever.

So the red head goes up to the mirror first and says," I think that I am the smartest person in the world" and Puff she dissapears.

The brunette goes to the mirror and says," I think that I am the most beautiful person in the world" and then Puff, she dissapears.

Finally the blonde goes to the mirror and says," I think" Puff...