Chuck Jones was influenced by Charlie Chaplin...
"Animator Chuck Jones, an enormous fan of Chaplin’s, lifted a few Chaplin gags for his Looney Tunes characters. For Bugs Bunny, he borrowed from The Gold Rush the idea of someone hallucinating that their pal is a piece of meat, and used it in several cartoons. (He also riffed on the Great Dictator’s dueling barbershop chairs for “The Rabbit of Seville,” starring Bugs Bunny and Elmer Fudd.)" ~ 10 Things I Learned: The Gold Rush By Abbey Lustgarten
http://www.criterion.com/current/posts/2334-10-things-i-learned-the-gold-rush
The Gold Rush - Thanksgiving Dinner:
https://www.youtube.com/watch?v=S0ajJ8isfVk
The Gold Rush - Charlie Chaplin turns into a chicken:
https://www.youtube.com/watch?v=lAop4Su5Uag
Wackiki Wabbit (1943) is one of the episodes with the "someone hallucinating that their pal is a piece of meat" theme.
Wackiki Wabbit:
https://www.youtube.com/watch?v=RFAulpHi0kA
What are some other episodes with that theme? Which was the first? I believe there are a few more.