As a person who life on the coast, I consider myself fairly jaded about sea creatures washing up to shore. The Joker is aware Batman life by just 1 rule ("I will not be an executioner") and encourages him to split it and kill him. The Joker is illustrating "The Market for Lemons": if the Joker is producing it straightforward for you to get rid of his henchmen, why ought to you believe they’re truly his henchmen?