Does anyone recall the movie or episode?

...where Bugs is antagonizing either Elmer or Porky and maybe singing opera or something like "Ta-ra-ra Boom-de-ay" or similar while hitting or stuffing him with food?

Maybe I am confusing this with "Pigs Is Pigs" see http://www.criticalcommons.org/Members/sammondn/clips/pigs-is-pigs/view.

"Sorry. If I've not responded to you either it wasn't necessary or I've set you to Ignore."