Grandma Simpson and Lisa are singing Bob Dylan's "Blowin' in the Wind" ("How many roads must a man walk down/Before you call him a man?"). Homer overhears and says, "Eight!"
Lisa: "That was a rhetorical question!"
Homer: "Oh. Then, seven!"
Lisa: "Do you even know what 'rhetorical' means?"
Homer: "Do I know what 'rhetorical' means?"