Avalanche

From the main menu, choose "special features"

Choose "Production Diaries"

Scroll down and highlight "Features" at the bottom of the screen

Hit the left arrow button and the marker on the floor will be highlighted.

Hit "enter". You will then see footage of an actual avalanche that occured during the filming of the movie as shot by the director of photography. Not only is it pretty cool to see, but listening to the reaction of the crew is pretty entertaining as well.