I love dolphins! They are super smart. Some years ago I rented a sail yacht, and early one morning me and a few friends went out to sea with it. I was sitting out on the front of it (sorry for my English, can't recall the exact terminology now), and the wind had the yacht leaning far to the side. So much that I could dip my hand into the water. And lo and behold, next moment we had a whole school of dolphins all around us, and one of them decided to swim right next to the fast sailing yacht, allowing me to pet it! It was the first time I touched a dolphin, and it allowed me to glide my hand over its back at that speed for probably a full minute. I was stunned, and although it happened years ago I still treasure the moment. It was like the dolphin knew I pose no threat to it, and wanted the contact. And the speed they can swim at to keep up with us was amazing.