A video has been posted on YouTube of an Australian man leaping on top of a passing shark from the side of a boat after being dared to do it by a friend.

In the footage, one of the men on the boat can be heard saying "Catch this tiger shark, Brett," and then "You gonna jump on it? I dare you. It's only a little tiger".

To which Brett replies: "It's only a man-eater."

"Here it comes, it'll only take your arm off don't be shy," his friend continues before Brett leaps from the boat appearing to land on the shark in the water.

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As he frantically clambers back onto the boat, his friend goes on to claim that he missed hitting the shark.