Indian Head Bobble

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I have noticed the Indian head bobble in couple of movies*. It's a little disconcerting. I suppose it depends on context, but in the movie scenes where I've seen it seems like the speaker (who is doing the wobbling) is not being completely truthful. The motion also seems to a bit snake like, somewhat akin to an underling attempting to worm his way into the boss's good graces, doesn't really know what his boss wants but is attempting to convey that whatever the boss wants is fine with the wobbler.

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