Maybe Fungie charges other dolphins to come and watch him and they all stay right down on the sea floor and watch as he makes the boats go round in circles and make waves and they all go 'ooh' and 'ahh' just like we did when Fungie jumped up!
And they're all really impressed becasue when they go above the waves there is jst normal sea-sound but when Fungie goes above the waves there's all this chattering and laughing and 'oooh-ing'.