The earliest evidence of the phrase Black Friday originated in Philadelphia, where it was used by police to describe the heavy pedestrian and vehicular traffic that would occur on the day after Thanksgiving. This usage dates to at least 1961. As the phrase became more widespread, a popular explanation became that this day represented the point in the year when retailers begin to turn a profit, thus going from being "in the red" to being "in the black".

People regularly camp out overnight outside stores and use propane and other heaters to keep warm. That turns them into Filthydelphians regardless of what city they are in. A number of people have died on Black Friday, including a luckless security guard who was trampled by a crowd trying to enter a department store (Target I think) a couple of years ago.

To get into the swing of things, I'm offering a Black Friday Special Sale of 40% off all of YOUR chips.