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What did you learn today?

Why April 20? There are a few theories.

A lesser-known possibility comes from the 1939 short story "In the Walls of Eryx" by H.P. Lovecraft and Kenneth Sterling. The story describes "curious mirage-plants" that seemed fairly similar to marijuana and appeared to get the narrator high at, according to his watch, around 4:20. Since the story is from 1939, it's perhaps the earliest written link between marijuana and 420.

Snopes says the term was coined by some California high school kids in 1971:

http://snopes.com/language/stories/420.asp

Today I learned "Most of the clocks in Pulp Fiction are set to 4:20 (but not all: when the kid receives the watch it's set at 9:00)."

Yeah it would have been inappropriate to hand the kid a watch set to 4:20.