Why Sponge Bob has Square pants O.O

Spongebob.....i despise him, with his obnoxious laugh, and his total obliviousness. he makes me wonder, Why does he have square pants?! I get the whole i'm a sponge thing, but sponges that live in the ocean arent really square shaped at all. they're all types of shapes, but most of them just look like piles of green mold on the ocean floor xD. so why does spongebob have square pants, well the answer is simple. spongebob is a dish washing sponge (the spoiler alert is for the kiddies). what i dont understand is why and how he ended up in the great blue underworld? and how can he sit at the bottom of the ocean when all sponges float. weird huh? lolz i know this may be kinda stupid to post but it just crossed my mind. oh also i remember the one episode when spongebob, patrick, and squidward were camping in spongebobs front yard, and they built a fire! lolz fire under water? really?! i love it, it's so cliche! Really i cant answer the question i presented as the title, but still spongebob is too funny :D , he even has square whitey tidies. but whats weird is that spongebob (this is only for people over the age of 17 to veiw) has a bubble butt. weird huh? lolz

End