Teacher: whoever answers my next question, can go home. One boy throws his bag out the window.
Teacher: who just threw that?!
Boy: Me! I’m going home now.

-------------------------------------------------------------------------------------------

Mother: What did you do at school today?
Son: We did a guessing game.
Mother: But I thought you were having a math exam.
Son: That’s right!

-------------------------------------------------------------------------------------------

Teacher: What is the chemical formula for water?
Student: "HIJKLMNO"!!
Teacher: What are you talking about?
Student: Yesterday you said it's H to O!

-----------------