4:20

First, there is no police code "420". There are no police codes referring to any particular drug, marijuana included. It's time to bury this myth. 4:20 was the designated time for a small group of smokers at San Rafael High School in California to meet at a specific location and light up. The number originates some time around 1971. It has since been adopted by smokers the world over as the "universal time to get high."