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TIL that in 1974, filmmaker Bob Clark directed a horror film, "Black Christmas," about a deranged killer who murdered girls on a sorority campus during the Christmas season. 9 years later in 1983, Clark once again directed a Christmas film, this time a family-comedy, titled "A Christmas Story."

D5XP TIL that Washington state has a mutual combat law that makes it legal for two parties to fight so long as the rules are decided ahead of time. The most famous use was when a real life superhero and a vandal had a consequence free fight in front of two cops.
QNKEa TIL that long before Cherry Coke was officially introduced by Coca-Cola in 1985, many diners, drugstore soda fountains and movie theaters dispensed an unofficial version by adding cherry-flavored syrup to Coca-Cola.
ADG9g TIL about Exclusive and Inclusive Counting. In English-speaking countries Sunday is seven days from Sunday (Mon, Tue, Wed, etc.), we exclude the initial Sunday. In Romance languages Sunday is eight days from Sunday, the first Sunday is included in the counting.
aawy TIL of the Atmos clock, a mechanical torsion pendulum clock which gets the energy it needs to run from temperature and air pressure changes in the environment, and can run for many years without human intervention. A temperature variation of only 1 degree is sufficient for two days operation.
RaVw TIL that at the 1988 magic championships a magician was disqualified because his performance was so astounding the other magician judges thought he must be cheating. He performed the same act three years later, (letting the judges shuffle the cards) and won.