The janitor from Scrubs was originally a figment of J.D.'s imagination.
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According to legend, there's a Superman in every episode of Seinfeld.
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John Swartzwelder, a writer for the Simpsons, used to write episodes while sitting in a booth at a coffee shop "drinking copious amounts of coffee and smoking endless cigarettes". When California passed an anti-smoking law, he bought the diner booth and installed it in his house.
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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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C3PO is the first character to speak in Star Wars.
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Shirley Henderson, the girl who played Moaning Myrtle (the ghost in the bathroom) was actually 37 years old when she played the character in the Harry Potter series.
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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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