Teacher : Which is the oldest animal?

Student : The zebra.

Teacher : How come?

Student : Because it's still in black & white.

Teacher: "Class, in this final exam, everybody should get at least 75% marks."

Student: "We are all trying for 100% sir!"

Teacher: "Are you being serious?"

Student: "Well, no sir. But it was you who cracked a joke first."

Johnny: Teacher, can I go to the bathroom?

Teacher: Johnny, MAY I go to the bathroom?

Little Johnny: Okay, but I asked first!