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Sometimes exposition is just necessary.  Although there's plenty of youtube videos with examples in *films* of exposition done right, I'm struggling to find good examples of *written* exposition.

I tend to learn best by seeing examples, so I've found that saying "use exposition in brief moments of urgency" doesn't help me write better, but "look at this conversation between Doc and Marty in Back to the Future - he drops exposition, but the urgency of the conversation keeps your attention".

So - how is exposition done well in writing?  If you have any examples, why did that exposition work in that story / character?