There was something really cool on the Shrek 1 DVD - if you put it into a computer, you could use a little tool called "Revoice Studio" where you could record voice lines for a few different scenes from the movie and then have the scene play back with your revoiced audio. It was a ton of fun!

I found this Youtube playlist which includes a bunch of people's different takes.

https://www.youtube.com/playlist?list=PLHxPId0U7JNhALhwS-3kD...