Cory Williams was walking with his girlfriend at a frozen lake in Anchorage, Alaska, when he picked up a rock to skip it. Turn your speakers up to hear the crazy noise it makes!

If you want to jump right to the action skip to 3:40.

Tim Konrad is the founder of Unofficial Networks and a passionate skier with over two decades of experience in the ski industry. In 2006, he launched the blog from Lake Tahoe with his brother John, evolving...