 The series follows the adventures and <unk> of the title character and his various friends in the underwater city of <unk> <unk> . In this episode , <unk> reads a " bad word " off a <unk> behind the <unk> <unk> , but does not know what it means . Patrick explains to him that it is a " sentence <unk> " which is used " when you want to talk fancy . " The two start using it in every sentence they speak . However , when Mr. <unk> hears them , he warns the two never to use the word again or any of the 13 bad words . Later on , <unk> accidentally swears again . Patrick then runs to tell Mr. <unk> with <unk> trying to stop him . However , when Mr. <unk> accidentally <unk> his toe , he <unk> all the 13 bad words . The two cannot believe it and run to Mama <unk> to tell on him . Mama <unk> , who is <unk> by their use of the words , makes the three paint her house as punishment . 
