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Split Personality ???
Answer
A split personality is when a person can be two different personalities at one time. On occasion they can appear nice, helpful, a good friend or even a good lover and without warning they could become selfish, arrogant and cruel. They flip back and forth between the two personalities.
Source: http://wiki.answers.com/Q/What_is_split_personality
Source: http://wiki.answers.com/Q/What_is_split_personality