http://www.damncoolpictures.com/2011/08/25-greatest-unscripted-scenes-in-films.html
I think "I know" is prolly Ford's best... even tho I've also heard Indy shooting the sword guy with a gun was also improv, I don't think there was dialog, he just had the flu. ;)
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"Once, during Prohibition, I was forced to live for days on nothing but food and water." ~ W. C. Fields
