Please expect to be stepped on, get your hair pulled, have tall people in front of you, have short people in front of you, have smelly people EVERYWHERE, have massive surges throw you every which way possible, and perhaps have beer or whatever thrown at you.
I still don't understand the people that complain about these things. They are simple facts. This is what happens - especially if you're trying to make your way up front. Don't put yourself in the crowd if you're not prepared for this sort of behaviour.
And you know what I hate, the giant 6 foot or perhaps taller guy(s) that get all agro and decide they have to start elbowing girls in the chest so they don't move in front of them. These girls were small, but that didn't stop him. What a douche!