Nassim Taleb was recently on Charlie Rose. For those of you who don't know, he is the author of "The Black Swan, the impact of the highly improbable". Taleb argues that analysts, the market, and investors too frequently discount the possibility of extreme events.
The link below shows the entire video. If you're looking for some of the highlights, watch the beginning of the interview when he explains the grounds for his theory, and at ~15:40 for about 2 minutes.