Bully For Bugs -- 1953

From Wikipedia:
In his biography "Chuck Amuck" Chuck Jones claims that he made this cartoon after producer Eddie Selzer burst into Jones' workspace one day and announced, for no readily apparent reason, that bullfights were not funny, and they were not to make a cartoon about them. Since Selzer had, in Jones' opinion, consistently proven himself to be wrong about absolutely everything, the only possible option was to make the cartoon.