When I first started college, the Dean came in and said Good Morning to all of us. When we echoed back to him, he responded Ah, youre Freshmen.

He explained. When you walk in and say good morning, and they say good morning back, its Freshmen.

When they put their newspapers down and open their books, its Sophomores.

When they look up so they can see the instructor over the tops of the newspapers, its juniors.

When they put their feet up on the desks and keep reading, its seniors.

When you walk in and say good morning, and they write it down, its graduate students.