How cool is this!!!

I've been out with dolphins in the waves like that.  VERY close to you, almost like they were just playing around riding waves with you.  Despite that I knew it was a dolphin I have to admit it was unnerving....

This is a surfers oh shit moment.....Dolphin or Shark.....Dolphin or Shark.

that picture doesn't look right. The fin looks like it was super imposed. And, I believe a shark fin is more triangular in shape.