April 20th

This is probably one of the weirdest holiday for some people. When people hear "420", they immediately think of Bob Marley and smoking/blazing some weed. And no, it is not his birthday or the day he died, but he's more like the spoke person of weed.
Other than that, it is Adolf Hitler's birthday and the day of the Columbine shooting in Colorado.
More so, this "420" started in San Rafael High School in California by a group of high school students. They smoke one on every 4:20PM. Then it just simply spread all-over places. Also called the "Cannibus" culture.

Fact/Fiction:
+ Adolf Hitler's birthday - True
+ Columbine Incident - True
+ Bob Marley's birthday/death - Fabricated/False