To painstakingly craft a life-size dummy, using one of only two pairs of Carhartts you own, only to send it hurtling off a jump to its certain death to the cheers of an inebriated crowd demonstrates a rare form of madness only found in ski towns like Big Sky, Mont. Perhaps it’s cabin fever. Or the tilted gender ratio. Or maybe watching stuff explode is just plain fun. Make your own diagnosis this February at Big Sky, starting with the Parade of Dummies, followed by the main event on the Ambush Headwall. And bring an extra pair of pants, just in case.