Lisa suffers a lunch accident and curses leading her to be punished for her language.
Lisa gets unfairly hit with some food during a food fight and she blows up, swearing a blue streak shocking everyone in the cafeteria. Principal Skinner punishes her by forcing her to work with Lunchlady Doris who has a tendency to swear and hoping that Lisa will not curse again. Lisa takes her medicine and decides to do a vegetarian meal for the faculty. But they swear a blue streak themselves and Lisa can't believe the faculty would react that way to healthy food.