Control Group: Vocal Infliction in Association with Boredom
Channel: Currlycutie
Date: 2012-01-20

This is a small clip from National Geographic's Opium Wars (The rights to which I do not own and give full credit to. I'm not making money. It's theirs). This goes along with a survey, which the link to is below.

http://www.sodahead.com/fun/control-group-the-effects-of-vocal-infliction-on-interest/question-2407707/