It should be Dumb People Friday.
"Black Friday, because only in America do people trample each other for sales, exactly one day after being thankful for everything they already have"
Black Friday was the name given to the Friday after Thanksgiving in the 60s by the Philadelphia Police Dept to describe traffic jams, shop lifters, jay walkers and massive crowds all shopping and taking advantage of sales after the holiday. Apparently it was used to deter people from going outside on that Friday as people could "get hurt" or "mugged" etc... It was later said to mean that stores having sales would "be in the black" from massive sales.
Nah - It's all about the books