Mick Fanning had no idea he'd be going head-to-head with a shark Sunday in a South African surfing contest.
Video shows Fanning paddling out when a fin surfaces behind him.
There's a tug and he falls into the swirling water scrambling for his board.
Luckily, the shark only bit off the board's leash, which was tied to Fanning's ankle
Fanning told reporters: "I just saw fins. I was waiting for teeth, and I punched the shark in the back.