Now this is cool.

[Bob Schroeck]

So, back in 1978, George Lucas, Steven Spielberg and Lawrence Kasdan sat down together over several days to brainstorm a movie idea Lucas had had, which he was calling Raiders of the Lost Arc. 
And they tape-recorded it all.
And the transcript is online.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.