Supposedly sound mixers for movies and TV create general crowd noises by having extras mutter "rhubarb, rhubarb" (or "peas and carrots") out of sync with each other. I don't know if the story itself is apocryphal or not (you'd think it'd just wind up sounding like a bunch of guys muttering "rhubarb"), but either way it's where the term for indistinct background dialogue gets its name.
(MST makes fun of this, too--in some of the Japanese movies Mike and the Bots will mutter "bok choy, sashimi, ramen" during crowd-chatter scenes.)
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Date: 2011-03-22 09:46 am (UTC)(MST makes fun of this, too--in some of the Japanese movies Mike and the Bots will mutter "bok choy, sashimi, ramen" during crowd-chatter scenes.)