April 20: Cannabis Day, the Columbine massacre, and Hitler's birthday

Today potheads all over the country (except students at the University of Colorado, Boulder) will joyfully light up a joint to celebrate National Weed Day. But this day isn’t just about marijuana. It’s also the 13th anniversary of the Columbine massacre and the birthday of Adolf Hitler. Naturally, Twitter had much to say about all three events:

https://twitter.com/#!/MasspikeMiles/status/193212293578891264

https://twitter.com/#!/strpljenspasen/status/193252185587458048

https://twitter.com/#!/AlDelBene/status/193235550986174464

https://twitter.com/#!/Dan_Anstey/status/193248807180451840

https://twitter.com/#!/NickadooLA/status/193220526125223936

Update: Predictably, no one is happier today than rapper Wiz Khalifa.

Related: Some disturbed Twitter users are paying tribute to the Columbine killers.