ATLANTA -- Cramer told a roaring crowd of Georgia Tech business students that InterContinental Exchange ( ICE) is "the single best way to play the volatility in oil." ICE is a derivatives exchange. Derivatives, Cramer explained, are options and futures. ICE is a great play on futures contracts, he said. Every time someone executes a trade, ICE makes money. Oil volatility means more trades are taking place, which in turn means more money for ICE, he said.