The bear market blues: 10 costly declines

MSN Money does a series of slideshows on market data which are often illuminating in terms of macro trends and big picture. This one: The bear market blues: 10 costly declines offers some interesting historical capture on 10 “bear' markets of the 1900's (not sure how they picked these ten, there were several other bad ones that were not included in the series).
Note some common themes throughout on human behaviour driving erratic markets. And keep in mind that only those not prepared for bear markets get mauled by them. Exit rules are required.