Never underestimate students...

Once, there was a teacher who didn't believe that God existed. Thus, he was thinking of a way in order to convince his students that God did not exist. Suddenly, he got an idea. Then, he took out a pen and spoke to his students...

Teacher: Can you see this pen?
Students: Yes, teacher.
Teacher: The pen is here, right?
Students: Yes it is.

Then, the teacher put his pen back into his pocket and he questioned his students once again.

Teacher: Now, do you see the pen?
Students: No, Sir.
Teacher: The pen isn't here, right?
Students: No it isn't.
Teacher: Do you see God?
Students: No, Sir.
Teacher: God isn't here, right?
Students: No, He isn't.

So, the teacher was so happy that he was done convincing his students that God did not exist. However, among his students there was a brighter one whose name was Wayne, raised up his hand.

Wayne: Teacher, can I speak up?
Teacher: Yes, of course. Come up front.
Wayne: My fellow classmates, do you see our teacher?
Students: Yes, we do.
Wayne: Our teacher is here right?
Students: Yes he is.
Wayne: Can you see his brain then?
Students: No, we can't.
Wayne: So, does he have a brain?
Students: No, he doesn't.