1) You spend time in front of a computer more than in front of a person.
2) You spend time reading PhD comics.
3) 30 page manuals are considered short to you.
4) Time passes faster when you're working.
5) There isn't really a lot of time when you're not working. (goes well with (4))
6) You regard junior year classes as basic classes.
7) Some of your classmates are married.
8) When weekends is a good thing because it means less traffic around campus.