Man blacks out on rollercoaster

A video has emerged from Canada of a man blacking out on a rollercoaster.

The clip, which was filmed on May 17, shows three friends on the Leviathian ride at Wonderland Amusement Park in Vaughan, Ontario,

All is going well until the ride drops for the first time when the man seated on the right loses consciousness and his head lolls to one side.

The others, who are enjoying the thrilling ride, don't notice that their friend is unconscious.

After a 20 seconds or so, the man regains consciousness and, as though nothing had happened, screams with delight as the rollercoaster twists and turns.