Last month, Mark McCracken was fishing out of a light open kayak off of Santa Barbara, California. Suddenly, at the 1:03 mark in this video, a hammerhead shark rammed his boat. He didn't fall out of the kayak, but the hammerhead kept on coming. McCracken hit the shark over and over again with his oar as it charged him.
He paddled back to shore with the shark staying close behind him. After beaching his kayak, he saw the the shark was still hovering in the surf, distressed at the one who got away.
My advice to McCracken: get home as fast as you can and don't answer the door if you hear a knock.