My favorite YouTube video is an excerpt from a 1985 episode of the Twilight Zone. It is hilarious and also shows what critical thinking actually involves. Since I also have a passion for mathematics, the role it plays in the story warmed the cockles of my heart. I also think that quite a few Witnesses would not only chuckle at it, but also realize that it contains some good food for thought. You can find it here:
http://www.youtube.com/watch?v=BoQ6ZC8EUQ0&feature=view_all&list=PL998049715F69A51C&index=0
Quendi