I think this was my second dolphin pic, where I was still working on the form of their heads, and merging them into a human body type.  If I remember correctly, this pic was partly inspired by a joke:

A man was asked to leave the hotel's pool.  When he asked why, he was told it was because he had been peeing in the pool.  "Well, everyone pee's in the pool!," the man said.  "Yes," replied the hotel employee, "but they don't do it from the diving board."

And as I wanted to do a 'phin pic, it just seemed to be a good combo :)