Above is a classic interview with Mel Blanc, who did pretty much every great Warner Brothers voice from Bugs Bunny to my favorite Foghorn Leghorn. What's nice about this interview is that Blanc goes into detail on his creative process, and he also reveals that Bugs Bunny was a cross between a Bronx and Brooklyn accent. It's amazing to think that those classic cartoons would require 125 people, take 9 months to produce, all for a cost of $50k (which was half a million in 1981 dollars). By the way you can tell from the interview that Dave respects Mel (which is pretty rare). Sadly Blanc passed away eight years later after this interview, but it's always nice to see the face behind the voice.
For you old tv fanboys, here's a non-politically correct comedy sketch with Mel Blanc and Jack Benny:
Letterman interview found via Neatorama.