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Every now and again a few members of the crew of the port Mafia would gather a rum bottle, some parchment, some ink, a writing utensil and something to seal the bottle with. They get someone who could write, usually Tanizaki (who was the least likely to ask questions) and would write some sob story about being trapped on an island. Why? Because it was funny and they hoped one day to see a navy ship going on a rescue mission in hopes of finding this 'lost person'. Sometimes pirates get bored so they play a little joke on someone.