It's hard enough being an actor and trying to become someone totally different on film. It's way more of a challenge when the whole world knows the real person you're trying to portray and will scrutinize even the tiniest inconsistency in your performance. So how did these famous actors do when they tried to become these famous people? You be the judge.
Via We Know Memes
Ashton Kutcher as Steve Jobs, "Jobs"

Daniel Day-Lewis as Abraham Lincoln, "Lincoln"

Aron Ralston played by James Franco, "127 Hours"

Truman Capote played by Philip Seymor Hoffman, "Capote"

Sid Vicious played by Gary Oldman, "Sid and Nancy"

Selena Quintanilla-Perez played by Jennifer Lopez, "Selena"

Muhammad Ali played by Will Smith, "Ali"

Sarah Palin played by Julianne Moore, "Game Change"

Ray Charles played by Jaime Foxx, "Ray"

Jim Morrison played by Val Kilmer, "The Doors"

Aileen Wuornos played by Charlize Theron, "Monster"

Jimi Hendrix played by Andre 3000, "All Is By My Side"

Alfred Hitchcock played by Anthony Hopkins, "Hitchcock"

Andy Kaufman played by Jim Carrey, "Man on the Moon"![actors and the real people they portrayed]()
Billy Beane played by Brad Pitt, "Moneyball"
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Bob Dylan played by Cate Blanchett, "I'm Not There"
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Buddy Holly played by Gary Busey, "The Buddy Holly Story"
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Charlie Chaplin played by Robert Downey, Jr., "Chaplin"
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Ernesto "Che" Guevara played by Benicio Del Toro, "Che"
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George W. Bush played by Josh Brolin, "W."
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Harry S. Truman played by Gary Sinise, "Truman"
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Harvey Milk played by Sean Penn, "Milk"
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Howard Hughes played by Leonardo DiCaprio, "The Aviator"
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Idi Amin played by Forest Whitaker, "The Last King of Scotland"
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Leonardo DiCaprio playing J. Edgar Hoover, "J. Edgar"
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James Dean played by James Franco, "James Dean"
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Joaquin Phoenix playing Johnny Cash, "Walk the Line"
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Lee Harvey-Oswald played by Gary Oldman, "JFK"
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Malcolm X played by Denzel Washington, "Malcolm X"
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Margaret Thatcher played by Meryl Streep, "The Iron Lady"
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Mark Zuckerberg played by Jesse Eisenberg, "The Social Network"
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Ben Kingsley playing Mohandas K. Gandhi, "Gandhi"
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Nelson Mandela played by Morgan Freeman, "Invictus"
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Billy Beane played by Brad Pitt, "Moneyball"

Bob Dylan played by Cate Blanchett, "I'm Not There"

Buddy Holly played by Gary Busey, "The Buddy Holly Story"

Charlie Chaplin played by Robert Downey, Jr., "Chaplin"

Ernesto "Che" Guevara played by Benicio Del Toro, "Che"

George W. Bush played by Josh Brolin, "W."

Harry S. Truman played by Gary Sinise, "Truman"

Harvey Milk played by Sean Penn, "Milk"

Howard Hughes played by Leonardo DiCaprio, "The Aviator"

Idi Amin played by Forest Whitaker, "The Last King of Scotland"

Leonardo DiCaprio playing J. Edgar Hoover, "J. Edgar"

James Dean played by James Franco, "James Dean"

Joaquin Phoenix playing Johnny Cash, "Walk the Line"

Lee Harvey-Oswald played by Gary Oldman, "JFK"

Malcolm X played by Denzel Washington, "Malcolm X"

Margaret Thatcher played by Meryl Streep, "The Iron Lady"

Mark Zuckerberg played by Jesse Eisenberg, "The Social Network"

Ben Kingsley playing Mohandas K. Gandhi, "Gandhi"

Nelson Mandela played by Morgan Freeman, "Invictus"

Via We Know Memes