http://www.youtube.com/watch?v=wehZNh_Cq-k

http://www.youtube.com/watch?v=a7jJg...eature=related

http://www.youtube.com/watch?v=8wyCW...eature=related

http://www.youtube.com/watch?v=0U-Ao...eature=related

http://www.youtube.com/watch?v=Y0dp0...eature=related

This gets quite hard to watch by the end but it is quite interesting.