A copy of the year 12 equivalent thread, for us uni people 
High school started at around 8-9am, but now anything before noon is considered “early”.
Weekends start on Friday.
6am is when you go to sleep, not when you wake up.
Instead of falling asleep in class, you stay in bed.
Going to the library is a social event.
Taking a nap in the library is perfectly acceptable.
You stay up late to finish homework then sleep through the class in which it was due.
A cancelled class is almost as exciting as Christmas.
You see people you know you’ve met but can never remember their names or how you know them.
Your bookstore bill will almost equal tuition.
Everyone is only nice for the first week. After that, no matter how nice you are, some people just won't smile back.
Ones that are personally true for me. The cancelled class bit is incredible! Last year in week 3 there was a massive hailstorm at uni, caused something like $60m worth of damage. I remember wandering around campus after the hailstorm had finished after midnight, and it looked like snow everywhere. And uni was cancelled the rest of the week (it was a Tuesday). Quite possibly one of the best weeks of uni ever.
Anyway, more things to add:
You spend more time at unibar than at class
You skip class to go have coffee, and see friends from the same class having coffee at the same café as you as well
You realise that you didn't go to class once the previous week, except for tutorials
You recognise half the people you pass when walking to class
You don't know what your lecturer for a course actually looks like
(one of my friends had never been to class and asked at his professor's department if he was around that day. It turns out the professor was a woman...)
You live on WebCT (I don't know what it is at other unis - it's basically the homepage for the courses you're doing at ANU, where lecturers put up all their notes and assignments and stuff)
You have fallen asleep in the front row, in a class with eight people in it
You don't actually know what your courses are about
You've been in the same courses as this guy four or five times now, and you still have no idea what his name is
You see townie friends at uni once or twice a semester when you actually turn up to class - and they're surprised, because they had no idea you were enrolled in that course