 It's Sunday morning on the radio. F is for friends who do stuff together. U is for you and me. He started off as a lowly resident of the underwater city of Bikini Bottom. Since then, SpongeBob SquarePants has truly risen to the top, worthy of a Sunday profile. Behind the gates at Nickelodeon Studios in Burbank, California, some tropical trouble was brewing in an undersea pineapple.