Hmmm, I do believe it's a stock Bethesda animation, used by that one guy behind the glass when you escape the Vault for the first time. To access it, I personally just use http://fallout3nexus.com/downloads/file.php?id=3284 mod. While you're at it, you might as well get the rest of the mods it includes. Links leading to them are on that page.
Awwwwww, jeez, thanks. I should just stick with scenics then, eh? I'll put up more when I get around to playing...