In Jurassic Park, the T-Rex wasn't supposed to come through and break the glass roof of the explorer during the attack scene, subsequently producing the noticeably genuine screams from the children.
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The iconic roar made by Godzilla was produced by rubbing a leather glove across the strings of a double bass.
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In 1997, Kevin Smith was hired by Warner Brothers to write the script for a Superman movie. He was forced to write Superman without the power of flight and he had to fight a giant spider. The movie would’ve starred Nicolas Cage.
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Chuck Palahniuk, author of Fight Club, prefers the movie version to his own novel.
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Heath Ledger asked Christian Bale to actually beat him for the interrogation scene in the Dark Knight.
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Rather than use CGI, Tim Burton had 40 squirrels trained to crack nuts for Charlie & The Chocolate Factory.
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The Rock accidentally knocked out Michael Clarke Duncan while filming a fight scene for The Scorpion King and had a custom Rolex made as an apology gift, but liked the watch so much that he kept it for himself.
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