A Piece of Duke History
The video files were taken during production of Duke Nukem 3D, and were eventually used in the game themselves. These files are very short, and have no sound, but you can get a look at the "real life" versions of the $100 bill animation, as well as the shotgun. The hands in these video clips are Steve Hornback's, who was one of the principal artists on Duke Nukem 3D.
You can download these clips here (all three of them are zipped up into one archive), and they require the Real Player to view (the new G2 beta is recommended).