This guy was just peacefully fishing off the coast of OAHU in Hawaii when suddenly every fisherman's (and ocean swimmer's) worst nightmare happened, a shark attack.  

From the kayaker - "Heard a "whooshing" sound, looked up and saw a wide brown thing on the side of the kayak. Thought it was a turtle at first. Happened so fast. Didn't realize I took my left foot out of the water to brace myself from impact and actually pushed the shark's head off with it.

If you asked me to do that again, even without the shark, I don't think I'd have that flexibility.  I actually only thought the shark rammed the kayak until I saw the video at home."