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15. Paris Hilton on ABC's Dan Harris
While promoting her Oxygen network reality show The World According to Paris, socialite Paris Hilton insisted time and time again that she'd matured since the days of her sex tape and The Simple Life. She was not mature enough to sit through some uncomfortable questions with ABC's Dan Harris, however, snickering, raising an eyebrow, and leaving the room after he asked her whether she was worried about her moment having passed.