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cafebabe writes:

Friday 19th September is International Talk Like a Pirate Day. From Wikipedia:

International Talk Like a Pirate Day (ITLAPD, September 19) is a parodic holiday created in 1995 by John Baur (Ol' Chumbucket) and Mark Summers (Cap'n Slappy), of Albany, Oregon, U.S., who proclaimed September 19 each year as the day when everyone in the world should talk like a pirate.

Further:

According to Summers, the day is the only holiday to come into being as a result of a sports injury. He has stated that during a racquetball game between Summers and Baur, one of them reacted to the pain with an outburst of "Aaarrr!", and the idea was born. That game took place on June 6, 1995, but out of respect for the observance of D-Day, they chose Summers' ex-wife's birthday, as it would be easy for him to remember.

At first an inside joke between two friends, the holiday gained exposure when John Baur and Mark Summers sent a letter about their invented holiday to the American syndicated humor columnist Dave Barry in 2002. Barry liked the idea and promoted the day.

They even have their own official web site complete with an English-to-Pirate Translator.