A group of professors were called and sat on a plane.

When the doors closed and the plane is about to take off, all the professors were informed that this plane is made by their students. Then all the professors rush toward the plane doors, trying to escape and survive on their own with exception of One professor remain seated with so much confidence and calmness.

Someone’s asked him why you’re not escaping the plane.

Professor answer him with confidence, they are our students.

Next Question: are you sure that you taught them well?

Professor replied quietly: I’m Sure it won’t fly.