Spongebob Squarepants & the Physical Impossibilities of Bikini Bottom

So Sandy Cheeks needs oxygen to live underwater, but the Krusty Krab does not?  Spongebob is an underwater fry cook, yet he's able to use fire.  And why is it that he can happily live underwater, but if he takes a bath he'll bloat out from the bath water?  Or, for that matter, how is there an underwater beach?  They're in the damn water!!  Besides, if someone wants to swim in Bikini Bottom, can't they just swim where they stand, or not stand, they're fish, yet nobody ever swims.  Not to mention that Mr. Krabs' daughter is a whale! 

Now for all the problems I have with Spongebob's underwater impossibilities, I have no problem with the Death Star exploding in the vacuum of space.  There's no oxygen there either, but when the Death Star erupts into a giant fire ring, I cheer.  Now, if by some change that is possible, my bad, I'm an unemployed parent who watches to much Nickelodeon not a astrophysicist, or a marine biologist.