What in the World - Guy defies death on Youtube, not as popular as Beiber.

Derp.

A skier filmed himself cheating death when he tumbled backwards from the top of a mountain while wearing a head camera.

Austrian Stefan Ager had just climbed up the mountain with friends at the Stubai Glacier, intending to ski back down, reports the Daily Mail.

Footage shot from his helmet cam shows him celebrating by taking a look around from the summit, capturing a clip of himself and putting his skis on.

But as Mr Ager clipped himself into the skis, he took a step backwards, lost his footing and ended up tumbling down the mountain.

The 15-second fall, down an almost vertical, rocky incline, was all captured on his helmet cam.

When he eventually landed, he let out an audible gasp of pain before looking up at the route he had just fallen down.

Incredibly, despite spinning out of control for much of his fall, he somehow managed to avoid being dashed on any of the larger rocky outposts - and landed safely in a snowdrift at the bottom.

He said: "I am sooooo lucky!"