Can anyone tell me?

Where did the 4/20 - 4:20 idea derive from? I mean is there some sort of relevance to marijuana.

Hitler's b-day was 4/20
Columbine Massacre 4/20

Bob Marley's b-day 2/6/45
2-6= 4 4x5= 20
probably a stretch huh?

Anyway let's see if we can get to the bottom of this.

Two high school kids in California invented it. They used to meet outside near their school at 4:20 and it spread from there.

That's it huh? Right on.

I also believe they also used 4:20 to try to find the "Secret Field"....of course they never found it...but yeah.

420 was used as a radio code by police many years ago.

there's many different theories. i once heard weed was made illegal on april 20 1937.