Unexpected catalysts are driving the share prices of some previously beaten down stocks sharply higher, presenting a buying opportunity for investors. Surprise earnings beats, new partnerships and takeover rumors are lifting the share prices of several well-known companies that had fallen on hard times.For investors, these catalysts present an opportunity to take a position as the stocks begin to rally off their recent bottoms, riding the share price to big gains. In the current set-up, the potential reward ...