Well, the school year at UCD is underway! This is my first year at UCD (transfer), and there are just bunches of things that are new to me. Some things are related to it just being a different school, others related to it being a BIG school.
I think the random thing that really kind of shocked me was the noise that 400 notebooks make when being closed all at once: I sat in the front row of a full class in Chem 194 (the big 400-plus seat lecture hall). The lecture wraps up, the professor says "okay, and that's it for today" and suddenly there's this enormous "WHOP-woooosh" sound as everyone in the hall got ready to go, all at once.
I'd never heard such a noise in my 3 years at CC; was kind of a shock at that time of the day. :)