The day that Marty McFly arrived in the future from BTTF2
(https://scontent-b.xx.fbcdn.net/hphotos-xaf1/v/t1.0-9/1003768_10206088700445139_8551329314186870322_n.jpg?oh=ad4bd2c19a7c498ca1ceb622ab12014e&oe=555BF8C3)
No, not yet! The REAL date is 10/21/2015 (http://knowyourmeme.com/memes/back-to-the-future-day)! ;)
Here's the Snopes article (http://www.snopes.com/inboxer/hoaxes/bttf.asp).
Whew!
Are we supposed to do something special on that day? picnic? Human sacrifice? Run over a tiny pine tree?
HOVERBOARD PARTY!!!!! :D