As we've documented, General Foods, now part of Kraft, had contracted with Warner Bros. during the 60's to use some of the Looney Tunes crew for commercial endorsements. Now, here's one that probably hasn't seen the light of day in over 50 years.
Here, Elmer Fudd is selling pre-sweetened Kool-Aid, which is new at the time, but Bugs Bunny is trying to cut in. In later years, Bugs would also pitch Tang and some of the Post cereals (Post now is owned by a German company.).
What makes this more of a collector's item is that this was directed by Fred "Tex" Avery, who hadn't worked with WB in several years.