A couple of really funny things for your approval:

The first is the 2-disc set an evening with Kevin Smith. If only for the story on the second disc on the injuries incurred the first time he was intimate with his wife. His stories shooting a documentary with Prince were equally as entertaining. Laughed until I cried.

Also, I have to recommend the director's commentary on Cannibal: the Musical. The DVD out of Troma, Trey Parker, Matt Stone and company, instead of commenting of the subtleties of making the movie, decide to drink throughout the screening. And by the end of the commentary, it's degenerated into hurling epithets and farting on each other.

I found it much more entertaining and educational than George Lucas' and Rick McCallum's commentary on Star Wars: episode I, actually.