Our ego, our personality, our “self”, all familiar words for what we think constitutes us as who we are and give us identity. You are you. And to further ground your identity, you’re given a name and surname that in most cases is unique. You’re given a social security number, which can only represent you and during the course of your life, you build a person that also makes you unique. You know who you are; your family and friends know who you are; the social and political institutions know who you are. Your identity is “stable”. But sometimes, some people impersonate other people, supplant their personalities, steal their identities, either with criminal intent or some deep psychological yearning to be another. They are masters of the switcheroo. Here are 8 of the most famous impostors.