1.

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Here's a supercut of Owen's marvelous 'Wow'. It should be noted that his brother Luke also tends to say 'Wow' a lot.
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Hamm's Don Draper from Mad Men was the master of making you feel dumb for asking or saying anything.
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Shia expresses many emotions by saying "No No No No No", especially when being chased by giant robots.
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Woody has many signature stammmers including "Sheezus", "Uh", "T-This is crazy", and "I-I-I'm stunned!", but "y'know" is probably the most used word of all.
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No actor besides Samuel L. Jackson can say such a nasty word and make it sound so satisfying and organic.