Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side! Man: (From inside a bathroom stall.) That's a right triangle, you idiot! Homer: D'oh!
Bart and Lisa: (Singing dull) Hot dogs, Armour Hot Dogs. Grampa: Sing it like you mean it! (Grampa plays harmonica and the kids sing it with style.) Bart and Lisa: What kind of kids eat Armour Hot Dogs? Bart: Fat kids. Lisa: Skinny kids. Bart: Kids who climb on rocks. Lisa: Tough kids. Bart: Sissy kids. Milhouse: (Sticks head from the window.) Even kids with chicken pox love-- Family: Hot dogs, Armour Hot Dogs. (Grampa stops playing harmonica.) The dogs kids love to bite! Lisa: Doesn't this family know any songs that aren't commercials? (Everyone except Lisa starts singing the "Chicken Tonight" jingle.)