The 'Iron Man' script was almost completely improvised

RDJ just really nailed going off-script.
 By  Mashable Studios  on 
The 'Iron Man' script was almost completely improvised
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While a good script is always a plus, some of the greatest moments in movie history come from talented actors getting a chance to go off-book. 

The results can be anything from hilarious to terrifying. Here are 10 of the greatest scenes born of improvisation in movie history.

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