National High Five Day

"National High Five Day falls on the third Thursday of April each year, which falls this year on April 15, 2010. The holiday originated at the University of Virginia in 2002, and has since spread across the nation, and around the globe."

http://www.nationalhighfiveday.com/

This Thursday, April 15, you are supposed to "high five" everyone you meet - provided, of course, that they are also celebrating National High Five Day. Otherwise, you'll be left standing there with your upraised arm, looking pretty silly...