The actor playing The Mountain in Game of Thrones Season 4, Hafþór Júlíus Björnsson, was only 25 years old at the time of filming.
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Jason Earles played as a teenager in Hannah Montana, but he was actually born in 1977.
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Heath Ledger locked himself in a hotel room for a month to prepare for his iconic role as the Joker in The Dark Knight
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Ian McKellen and Patrick Stewart had no idea how to play chess when they appeared in X-Men 2.
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As a child, Jim Carrey wore tap shoes to bed just in case his parents needed cheering up in the middle of the night.
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For each word he said in Terminator 2, Arnold Schwarzenegger was paid $21,429.
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