4/20 Only Comes Once a Year [Video]
According to the always reliable internet, the term "420" began in California back in the 1971, when some teens decided to meet at 4:20pm for a little "puff puff give" near a statue on their high school campus. This became their recurring time to meet and eventually became code for partaking in the ganja.
Nowadays "420" has become an entire subculture of marijuana lovers. And I'm sure there are some folks who treat 4/20 like a national holiday...or like Christmas. Well the folks at Funny or Die have put together an absolutely brilliant video of what 4/20 might look like if it were more like Christmas.
Try not to get choked up watching.