Time to get flamed.
Black Friday is...?
It's a sale day for Americans. Takes place around the time of American Thanksgiving.
Boxing Day earlier in the year.
Businesses and stores reduce their prices so their moneymaking score is as not negative in number as possible. Places like Wal-Mart and Best Buy will reduce prices to sell off merchandise and still make money.
Last year (I think) a Wal-Mart immigrant greeter guy got trampled to death. This led to Wal-Mart security evaluation. Law suits can happen following Black Friday related injury.
Unrelated...
A tornado went through the Edmonton area of Alberta (Tornado Alley, Canada) in mid-80's. Damage and stuff. Some deaths. Hence another sort of Black Friday. A few farms even preserve the damage to their property (not the bloodstains or cow parts).