Paralinguistic knee bend

Sometimes when people are talking in real life, or you can see this on TV shows and in movies, they do a very quick knee bend. Why do we do this? Sufficient googling answered the question of "Why do we click our tongues" (it's a discourse marker, thanks) but I haven't narrowed this one down yet and I can't figure it out by reasoning and observation of my own and others' behavior.

*****************************

( Read more... )