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Source: Den of Geek
There's a reason we view inspiration as some sort of mystical force -- it can come from anywhere, from the utterly bizarre to the completely mundane. The one constant is that it's surprising and unpredictable. And sometimes, that inspiration leads to onscreen magic.
For example:
Source: Vanity Fair
Source: Vanity Fair
Source: Den of Geek
Source: Variety, The Hollywood Reporter
Source: GamesRadar, The Dissolve