In a move no one could have seen coming, hedge funds have devised a strategy to turn a few rules on their heads in order to drive down stocks they’re shorting. Thanks to a changes in patent laws implemented in 2012, hedge funds can now challenge patents for the bargain price of just $23,000 (which effectively means deep pocketed fund managers can have as many reviewed as they want) in a process that is now far more efficient than it once was.