Tin whistle. Fish

There was one man who lived on the shore of a warm ocean, went fishing, like all the inhabitants of this coast.
But unlike other fishermen, this man liked to climb into the biggest fish. Why, you may ask. I don't know, I'll answer.
And then one day, this man got into the fish and got stuck in it, and began to live in the fish.
The fish was still alive, but he got into it, and they began to live together, went to a nearby bar in the evenings, swam together, only they didn't go fishing anymore.
That's the story.