A cool video of a man in Canada demonstrating how to make your phone produce a video with a 3D effect.

The footage, filmed in Montreal yesterday, shows the man explaining step-by-step how the trick is done, before swinging the camera wildly around around his head to create a 3D video effect on the camera.

The filmer later wrote online: "A cool (and risky) hack to turn an ordinary phone into a 3D camera.

"Make an "I" knot around the case, tie a rope to the centre, attach a bag to one end for drag, and swing like a mad-man with no shame."