Can't top you, but I got a video of me being unexpectedly bumped by a giant green sea turtle in Hawaii because I was snorkeling in a lagoon where there was a bunch of mossy turtle grass they like to eat. I was in the way of it's food so it just moved me by ramming me in the middle of my back. I almost came out of the water like a Polaris missile. It had a head like a football and a shell bigger than my mom's old big round living room coffee table. I'm scared of even little snapping turtles and presumed that this one could snap my arm off if it wanted to.
On that same trip, I got a video of a barracuda zipping around in the same lagoon at warp speed and then I immediately left the water after seeing the recently hand-made sign which read "Beware: The barracuda is back. It will take a chunk out of you."
I’m thinking about getting a kayak and go at least a mile off shore with clearer water to record underwater and maybe spearfish. I only wish I had this GoPro camera the time in California when I was snorkeling in the kelp beds off Zuma beach and came face to face with a WHALE not 15 feet away. I could have gone closer but I was warned a whale can break your bones with just a quick flip. BTW, the whale remained in place for at least 10 minutes so I would have had good footage. Very impressed by its big eye just staring at me.