Catfish - The Movie - Ending Scene

Who are the catfish in your life?"They used to tank cod from Alaska all the way to China. They'd keep them in vats in the ship. By the time the codfish reached China the flesh was mush and tasteless. So this guy came up with this idea that if you put these cods in these big vats, put some catfish in with them. And the catfish would keep the cod agile. And there are those people who are catfish in life. And they keep you on your toes, they keep you guessin' they keep you thinkin' they keep you fresh. And I thank god for the catfish, because we would be dull and boring if we didn't have somebody nipping at our fin."