(Video Link)
The Canadian documentary show How It's Made shows viewers how ordinary objects in their lives are created. This segment explains how crayons are made. The factory in the video can produce 30,000 crayons an hour.
via Flavorwire | Show Website (warning: sound)
http://pbskids.org/rogers/video_crayons.html
Done at Baylor University a few years ago.
http://www.youtube.com/watch?v=s_wcG1Mlsmg