Think you will find that is nothing to do with black friday as we know it.
The earliest known use of "Black Friday" to refer to shopping on the day after Thanksgiving was made in a public relations newsletter from 1961 that is clear on the negative implications of the name and its origin in Philadelphia.
Quote:
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For downtown merchants throughout the nation, the biggest shopping days normally are the two following Thanksgiving Day. Resulting traffic jams are an irksome problem to the police and, in Philadelphia, it became customary for officers to refer to the post-Thanksgiving days as Black Friday and Black Saturday. Hardly a stimulus for good business
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http://en.m.wikipedia.org/wiki/Black_Friday_(shopping)
It was used by traffic police to refer to the amount of traffic on the roads.
although over the years there are many other uses for the term black friday. Shopping related use only started in 1961.