keep a firm grip on the handrail and ride runaway escalators to the bottom and then exit quickly. >> it sort of registered into something that was a wild and crazy experience that we hope doesn't ever happen again. >> an ice-covered lake may look like a winter wonderland, but perils exist just below the surface. it happens dozens of times in the u.s. every year. unsuspecting people plunging through thin ice and succumbing to the frigid water. christmas day 2012. a great opportunity for mickey herman, his wife and two daughters, to film some sledding with their new camera at jackson lake in southern california. >> we noticed the guys taking the tubes were going up a lot higher on the hill, which resulted them going out much further onto the lake that was frozen and getting very close to the part that wasn't frozen. >> look at that big crack. is that a big crack next to him