The man lying down assumes (probably correctly) that the other two have been reminded about the story about the beached whale by the fact that he is rather fat and resembles a whale himself. I think his final sentence is a threat - he has understood their "joke" about his size and is threatening to hurt/kill them (or something) as a result. If that happens, they will probably be featured on the news as well.
I should point out that his threat is (I hope) meant as a joke!
Student or Learner