[DrewDevil]

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also love how when the dude is at ralphs he hears george bush say the bit about the line in the sand and he then uses it later on in the movie.

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I didn't even catch this until my most recent (and probably 50th) viewing of the movie a week or two ago. Bush Sr. busts out the "this aggression will not stand" line and then the Dude later uses it when Lebowski is attacking his character. Awesome.

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The Dude recycles other people's words throughout the movie:

this aggression will not stand (Pres. Bush)
in the parlance of our times (Maude)
we're gonna cut your dick off, man (niilists)
sometimes you eat the bar, and sometimes... (Stranger)