Freshmen: Are never in bed past noon.
Seniors: Are never out of bed before noon.
Freshmen: Read the syllabus to find out what classes they can cut.
Seniors: Read the syllabus to find out what classes they need to attend.

Freshmen: Brings a can of soda into a lecture hall.
Seniors: Brings a jumbo hoagie and six-pack of Mtn. Dew into a recitation class.

Freshmen: Calls the professor "Professor."
Seniors: Calls the professor "Bob."

Freshmen: Would walk ten miles to get to class.
Seniors: Drives to class if it's further than three blocks away.

Freshmen: Memorizes the course material to get a good grade.
Seniors: Memorizes the professor's habits to get a good grade.

Freshmen: Knows a book-full of useless trivia about the university.
Seniors: Knows where the next class is. Maybe...