I didn't really enjoy my freshers week or get particularly involved in it, but lots of other people did. There's a "who pulled who" facebook page for the university and embarrassing pictures often end up there after nights out.
You get the typical drunken nights out, not much else. But two people ended up naked on stage in the SU bar during an event just after freshers week. They did something called "iron stomach" which was an eating competition for the must disgusting things imaginable, and they had to take clothes off at some stages (first it was the shirt, then the trousers, etc.) The final two survivors were the ones who ended up naked.