1. Logout.
2. Login as root.
3. Browse to /Applications/iTunes.
4. Control click on iTunes.
5. Select "Show Package Contents"
6. The animation or whatever it is has to be in the file "iTunes.rsrc"; it's the only thing in the application big enough to hold it, but I don't know which application to use to open it. I would suspect that it's on the developer tools CD that shipped with retail packages of OS X, and downloadable from Apple's web site. Happy hacking!