Magic Mirror

There are 3 people standing in front of a magic mirror. The mirror gives you anything you desire if you tell it the truth, but you disappear if you lie. The first person to talk to the mirror was a very fat brunette. She walked up to the mirror and said "I think I am the thinnest person in the world." and poof, the mirror gobbled her up. The next person to come up to the mirror was a very ugly red head. She told the mirror "I think I am the prettiest person in the world" and poof, the mirror gobbled her up. Lastly came the blonde. She walked up to the mirror and said "I think...
" and poof, the mirror gobbled her up.