Teacher: "Give me a sentence starting with the letter 'I'".
Pupil: "I is-"
Teacher: "No, you must always say 'I am'."
Pupil: "Okay, 'I am the ninth letter of the alphabet'."
TEACHER: What is the chemical formula for water?
SARAH : "HIJKLMNO"!!
TEACHER: What are you talking about?
SARAH : Yesterday you said it's H to O!
TEACHER: George, go to the map and find North America.
GEORGE : Here it is!
TEACHER: Correct. Now, class, who discovered America?
CLASS : George!