Great Kid's Comebacks

TEACHER: Donald, what is the chemical formula for water?
DONALD: H I J K L M N O.
TEACHER: What are you talking about?
DONALD: Yesterday you said it's H to O.

TEACHER: Millie, give me a sentence starting with "I."
MILLIE: I is...
TEACHER: No, Millie... Always say, "I am."
MILLIE: All right... "I am the ninth letter of the alphabet."

TEACHER: George Washington not only chopped down his father's cherry tree, but also admitted it. Now, Louie, do you know why his father didn't punish him?
LOUIS: Because George still had the axe in his hand.

TEACHER: Clyde, your composition on "My Dog" is exactly the same as your brother's. Did you copy this?
CLYDE: No, teacher, it's the same dog.

TEACHER: Harold, what do you call a person who keeps on talking when people are no longer interested?
HAROLD: A teacher...