I have a comment on Janet Kwak's blog that is worthy of being posted here:

My theory on when you know you're a Cal Student: if you've memorized the announcement the library people make at 9 and 9:30 PM...

In particular, you'll notice a difference in the two announcements: at 9, they say, "patrons wishing to check out library materials are encouraged to come to the Moffitt circulation desk soon."

At 9:30, they replace that last word soon, with immediately.

Yes, I'm truly a nerd for knowing that.