Turns out your best bet against a shark may be to start swinging. Marcel Brundler was surfing off the coast of Australia when he spotted what he thought was a dolphin. He "realized fairly quick" he actually was coming face to face with a shark.
"Then it kind of dived off, came back and circled me," he remembers, "and took a fair notch out of my board, circled me again, then it got me on my [westsuit], it got me on my hip." Brundler says he was "shouting and punching" the shark while it attacked him.
Brundler only suffered a minor scrape on his leg along with a bite mark on his board and a ripped wetsuit.