In 2011, a surfer named Doug Green was badly startled when a small shark, probably a juvenile white shark, tried and failed to jump over the front of his board. After a bit of difficulty, it shimmied back into the water.
Brian Hovnanian got a similar scare in 2009, when a shark leapt onto his standup paddleboard, knocking him over. He fell on top of the shark, which then flailed its way back off the board. Hovnanian was unharmed.
Also in 2009, Scott Barton got the worst of it, and it still wasn't that bad. After riding a wave back to shallow water, he turned to paddle back out. As he did so, he felt something brush against his left foot. Then, he felt teeth. He kicked his leg, the shark released him, and he yelled to his girlfriend, also surfing, to paddle in. The unidentified shark was small.