Thanks to a reader for sending:

“10-9 is bike messenger appreciation day

Here is a link I would like to share:

In 1991, a mayoral proclamation decreed that October 9 of every year would be Messenger Appreciation Day in San Francisco. October 9 is “10-9” in radio code and means “Say again” or “What?” 10-9 Day is celebrated informally all over the world.

May taxi cabs and secretaries thank there bike couriers whom fight amongst traffic and deal with the elements. #winteriscoming.

Marion Barry jr also wrote a letter to announce this in 1998″