People are fishing. The boy caught a man in a suit.
There is a man in the water wearing a suit and the boy somehow caught him.
Why is there a businessman in the water?
Nice catch, son, now close the deal.
scene: lake description: People are fishing. The boy caught a man in a suit. uncanny: There is a man in the water wearing a suit and the boy somehow caught him. entities: Businessperson, Bait_(luring_substance). caption: Nice catch, son, now close the deal.
A play on the term "catch" --- usually, a "nice catch" in the context of fishing would be a literal big fish. But here, the father is congratulating the son on a big "catch" in the business sense, i.e., a valuable client that one is competing to attract the attention of --- going one step further, the child is encouraged to "close the [business] deal". It's funny in part because it takes a wholesome fishing trip and makes it into a more ruthless introduction to the business world for the child.