Some people court danger for thrills. Take Matthias Giraud and Stefan Laude, for example, who carefully planned their “Ski an avalanche” stunt in the French Alps. They are both expert skiers and skydivers and wore avalanche location devices and had a helicopter rescue team on standby. With Laude parachuting and filming from overhead, Giraud skied off the cliff with an avalanche in pursuit. GoPro HD Helmet HERO CameraGoPro HD Helmet Cameras) captured it all on high definition video.