Multiple Personalities
Modern science considers people having multiple personalities to be suffering from 'Dissociative Identity Disorder' and urges one to get help from the psychiatrist. But human beings are too complex to just be the same person all the time. In fact over time, we might undergo so many transformations that the future us cannot recognize the present us and the present us cannot relate to the past us. To borrow Ted's language from HIMYM, we all become doppelgangers of ourselves as we evolve. Even if we discount the time factor, we behave differently with different people and in different circumstances. How much ever people may claim to be what they are, the truth is we are ultimately human and we mirror the actions and behavior of the person we are interacting with. A lot also depends on the comfort level we share with others, our own mood swings, the vibes we get from a person and a host of other factors. Then it brings to focus a pertinent question, "Who really are we?&quo