Of course, that won't help you when prices aren't being "normal". But then again, there aren't too many ways (fundamental or technical) that will help when the markets get a mind of their own
Bollinger Bands for Ford Stock Prices
Chart courtesy of Stockcharts.com
The middle "band" is the moving average of price. The upper curve represents the moving average plus two standard deviations. The lower band represents the moving average minus two standard deviations.
The distance between the upper and lower curves gives you an idea of price volatility; the wider the distance, the more volatile the price has been.