SpongeBob has to take out the trash at the Krusty Krab. While at the dumpster, he decides to have a little fun and read the graffiti on it. After reading some weird ones, and "finishing" one, he comes across a weird one.
"Krabs is a..." Wait now. What's that word? "Krabs is a *dolphin chirp*" Obviously, for the use of a dolphin chirp and the reaction by the garbage collector, it can be understood that SpongeBob has used a bad word.
Patrick comes along and explains to SpongeBob that the bad word is a "sentence enhancer." That does the trick. Now SpongeBob is using the word all the time.
The next day at the Krusty Krab, Squidward hears SpongeBob swearing up a storm with the bad word. He whispers to Mr. Krabs the bad word that was used. That's when Mr. Krabs tells SpongeBob and Patrick to never use "bad word #11."
Later, SpongeBob and Patrick are playing Eels and Escalators. SpongeBob keeps trying hard to get the escalators, but keeps getting the eels. Patrick, however, gets the escalators every time. SpongeBob soon has only one turn left which he takes, and for a second, it seems like he got the escalators. But then, the dice make a turn, and it's clear that SpongeBob got the eels.
That sets SpongeBob off. He uses the bad word and Patrick attempts to tell on him, but then uses the word himself. Now, SpongeBob and Patrick are both racing to the Krusty Krab to tell Mr. Krabs what each other did.
SpongeBob makes it first, but Patrick, finishing an ice cream cone, is there not too much later. They tell Mr. Krabs what happened, and he takes them outside. His punishment for them? Give the Krusty Krab a fresh coat of paint.
But then, Mr. Krabs hurts himself on a pebble, and he uses all 13 bad words. "We're going to tell your mother!" says SpongeBob. So, despite Mr. Krabs telling them that "her poor, old heart can't take it," they tell her.
It looks as though Mr. Krabs was right. As he takes some change from her pocket, Mama Krabs shows that she was faking, and has Mr. Krabs, in addition to SpongeBob and Patrick, paint her house a fresh new color.
Mama Krabs comes out with lemonade for the three foul mouths. She hurts her foot on a rock. "Oh my *honk* foot!" she says. Mr. Krabs is shocked. Mama Krabs points out to him that the honking sound was not a bad word, but rather Old Man Jenkins in his boat. They all laugh.
Squidward is starting his new art He is ready to be teaching fellow Bikini Bottomites true art skills. His is there, but it turns out that they thought that the art was cooking. SpongeBob, however, was aware of it being an art and is eager to be taught by his next-door neighbor.
SpongeBob is told that with luck, some of Squidward's talent may rub off on him. However, SpongeBob turns out to be way better at art than Squidward. Whether it's a perfect circle, a statue, origami, or "rippy bits," SpongeBob would do better teaching Squidward instead.
Squidward, however, doesn't want to tell SpongeBob how good he is, though inside, he knows the truth. He puts a nose resembling that of himself where the nose on the statue SpongeBob made is. SpongeBob ends up being hauled away to the dump when a door pushes him out the window and into the dumpster. At that same time, an art dealer comes and sees the statue SpongeBob did. He thinks it's amazing.
Since this could get him the fame he's always wanted, Squidward takes credit for SpongeBob's work. However, the head of the statue falls off, just as it's being carried out of the building. Squidward is told to make another one. However, since he wasn't the one who did it, he has to find SpongeBob and get him to do another one.
SpongeBob is now doing the artistic things just like Squidward did. Squidward goes insane and destroys all of the artwork around him while SpongeBob runs through the wall of the building and heads to the dump again.
The art dealer gets back when Squidward's done destroying everything. Squidward gives the janitor the responsibility for what he did. But, it turns out that Squidward made another statue that is exactly the same as SpongeBob's. "You, sir, are the greatest artist who ever lived!" the janitor is told.