1. The people who are overachievers with piles of books.
2. Sleepers.
3. Aggressive campers.
4. Caffeine addicts.
5. People wandering and fighting for places to sit.
6. People pretending to study.
7. People who won't stop talking or complaining.
8. People having mental breakdowns, crying from stress.
9. People enforcing the "quiet" on the quiet floors.
10. People who seem to have their crap together.
11. The couples.
12. People who are new to the library.