Elmer Fudd and Bugs Bunny from the cartoon, A Wild Hare

While Porky’s Hare Hunt was the first Warner Bros. cartoon to feature a Bugs
Bunny-like rabbit, A Wild Hare, directed by Tex Avery is widely considered to
be the first official Bugs Bunny cartoon. It is the first film where both Elmer
Fudd and Bugs are shown in their fully developed forms as hunter and
tormentor, respectively; the first in which Mel Blanc uses what would become
Bugs’ standard voice; and the first in which Bugs uses his catchphrase,
"What’s up, Doc?".  A Wild Hare was a huge success in theaters and
received an Academy Award nomination for Best Cartoon Short Subject.