No case or book. Bikini Bottom has to do with the fact that the town is located next to an island making it a beach , hence the name bikini -- and the fact that they are at the BOTTOM of the ocean, hence the name Bottom. As for the "bad words" they were saying, the entire point of the show was that saying bad words is something you just don't do, not only because it's rude but because it's socially unacceptable hence why all the customers left the Krusty Krab when Spongebob started swearing. Back says Nooka New York City. And as for the violence, what part of it is adult?