“Ah, you’ve done grand, laddie! Now you know what you have to do: burn the house down! BURN 'EM ALL!”

The leprechaun’s presumably a figment of his imagination, so it counts as a line from him.

Mrs. Krabappel and Principal Skinner were in the closet making babies and I saw one of the babies and the baby looked at me

Hi Super Nintendo Chalmers.

Oh boy, sleep! That’s where I’m a [literal] viking

“This tastes like grandma!” wins for me because it’s immediately followed by Chief Wiggum: “You’re right son, it DOES taste like grandma!”

It’s a toss up between “Me fail English? That’s unpossible” and “It tastes like burning”!

“The doctor said I wouldn’t have so many nose bleeds if I kept my finger outta there.”