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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Johnny Depp travels with his Capt. Jack Sparrow costume to make impromptu visits to sick kids in hospitals.
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Nicole Kidman is scared of butterflies.
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Leonardo DiCaprio was named Leonardo because his pregnant mother was looking at a Leonardo da Vinci painting in a museum in Italy when DiCaprio first kicked.
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Peter Cullen, the voice actor who voices Optimus Prime, also voices Eeyore from Winnie the Pooh.
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In their early careers, Sylvester Stallone and Jackie Chan both took part in porn.
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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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