It happens not infrequently in NZ. I was on a small RIB with some mates and a couple of kids and a pod approached us in two metres of water. We had just been snorkelling/freediving and had no idea they were in the area. They were hunting stingrays. Seeing the male up close put things in perspective, it was bloody huge! Sadly, not one camera or phone between all of us!
Another encounter when I was jetski fishing. I was drifting when four young adults came in fast from each direction. They stopped just off the ski and decided I wasn't food. I didn't know whether to **** myself, get out the area or get the camera! A very cool experience.