Linguo was a grammar-correcting robot created by Lisa for the science fair. Whenever Linguo detects a grammatical error it responds with the correct answer. Homer nearly destroys Linguo when he mistakes it for a toy robot and gives it beer. Lisa fixes Linguo, but it is later destroyed when members of the Springfield Mafia make numerous grammatical errors in its presence, causing an overload of Linguo's circuits. Linguo's last words are voiced in correction of Homer: "Linguo is dead."