New Delhi, Dec. 31 -- Insulting the director who is making a documentary about you might not be the most diplomatic of choices. Then again, Chevy Chase has never been very diplomatic.

The comedian gets snarly at the top of filmmaker Marina Zenovich's "I'm Chevy Chase and You're Not," which airs Thursday on CNN. During their very first meeting, he warns her it isn't going to be easy to figure him out. She asks him why.

"You're not bright enough, how's that?" he replies.

That the exchange made the film says a lot about Zenovich and also about Chase, a gifted physical comedian who starred in classic 1970s and '80s comedies like "Fletch," "Three Amigos," "Caddyshack" and the National Lampoon's "Vacation" franchise.

"He's one of those peop...