PROVE TO ME THAT THE CHAIR IS NOT THERE

A professor of philosophy runs to give the last lecture. Whileplacing a chair at his desk, the professor instructs his students,"Using everything you've learned in this course, prove to me thatthis chair is NOT THERE."

So, many students who start a long story that proves that this chairdoes not exist, except for one student. He spent five seconds to write the answer, submit the answer sheet, then exit the classroom.His friends were amazed with the student's behavior.

Over time, all students receive their final grades ... and a stunning,students write for five seconds before getting the highest score inthe class.

The answer he wrote was: "What chair?"