Watch Tesla and SpaceX CEO Elon Musk 'Wing It'

— -- Elon Musk didn't become a billionaire without being willing to take some bold risks.

The Tesla and SpaceX CEO made another one when he took a walk on the wild side over the weekend, daringly stepping onto the wings of a plane as it cruised through the sky.

Musk posted a photo of the high-flying stunt to his Instagram account on Sunday, writing: "Went for a nice wing walk. What could possibly go wrong?"

In a video showing Musk wing walking, the billionaire looks steady as he stands on top of the moving bi-plane, proving one of the many reasons why he may just be the real-life Iron Man.