Actually, 420 explained the meaning already in another thread. And yeah it's "National Pot Smokers Day," "Hitlers Birthday," and the "Anniversery of the Columbine Shootings."
That doesn't stop it from being my favorite date, nor my favorite number along with 42 though!
Random statement that isn't as random as you all think it is:
"The best prophet of the future, is the past."
I'm hungry. =/