Well, I don't really shop on Black Friday, but shopping in general is easier for me alone. I can shop with a friend if I'm just browsing or just socializing (which is tons of fun) but for serious, commando mission gotta get it done shopping, I go alone. As others have said, then I can go where I want and go home when I want (or when I'm worn out, which usually comes first!). I actually like to shop alone, even just window shopping...
On Black Friday I like to stay home, maybe shop on line a little, and have friends over for breakfast after they finish their early morning runs. This year, I'll be hosting an open house brunch for my business...people can shop at my house, and get breakfast!!