Possibly one of the most enigmatic creatures around. Some interesting "expert" theorisation in this article. It's quite touching in a way, showing the sort of respect for the departed usually displayed amongst (most of) humanity.
I know someone who ended up in hospital with a massive hematoma because she was attacked by a male dolphin when she was snorkelling whilst menstruating. Never forget they are wild animals.
I've read reports of dolphins trying to drown swimmers, getting sexually excited with women and attacking people. Don't know if they are true or if the events were interpreted correctly