As you can see from this video people have a list they plan on following. That means even if they have to fight for it. You definitely should have a list to follow, so you can try to avoid those "Black Friday Smack Down's".
This video demonstrates what not to do while Black Friday is going on. Tensions are already high, so getting in a fight and arguing doesn't help anything. You need to follow rule # 4 and be nice and stay calm.
This video demonstrates this pretty good. They all had a game plan to go to certain places inside of Urban Outfitters. This is shown in one point in the video where everyone was grabbing things off of shelves at different points in the store.
This article explains some common rules of the treacherous day we call "Black Friday". These rules are the 5 most common rules you should follow when it comes to shopping.