A college student was in a philosophy class which had a discussion about Gods existence. The professor presented the following logic:

Has anyone in this class heard God? Nobody spoke.

Has anyone in this class touched God? Again, nobody spoke.

Has anyone in this class seen God?

When nobody spoke for the third time, he simply stated, Then there is no God.

One student thought for a second, and then asked for permission to reply. Curious to hear this bold students response, the professor granted it, and the student stood up and asked the following questions of his classmates:

Has anyone in this class heard our professors brain? Silence.

Has anyone in this class touched our professors brain? Absolute silence.

Has anyone in this class seen our professors brain?

When nobody in the class dared to speak, the student concluded, Then, according to our professors logic, it must be true that our professor has no brain!

The student received an A in the class!