Three women and a genie.

Three women are at a house, one redhead, one brunette, and
one blonde.

A genie appears and says the women can say anything, but if
they tell a lie, they disappear.

The redhead says, "I think I am the smartest woman ever,"
and she disappears.

The brunette says, "I think I am the most beautiful woman on
Earth," and she disappears.

The blonde says, "I think-" and she disappears.

Source:Amusing facts