Baron Rothschild, an 18th-century British nobleman and member of the Rothschild banking family, is credited with saying that "the time to buy is when there's blood in the streets."
He should know. Rothschild made a fortune buying in the panic that followed the Battle of Waterloo against Napoleon. But that's not the whole story. The original quote is believed to be "Buy when there's blood in the streets, even if the blood is your own."
Going Against the Crowd
Contrarians, as the name implies, try to do the opposite of the crowd. They get excited when an otherwise good company has a sharp but undeserved drop in share price. They swim against the current and assume the market is usually wrong at both its extreme lows and highs. The more prices swing, the more misguided they believe the rest of the market to be.