420

420 is one of the most epic segments in TripTank, where the characters smoke hemp with a bong when it's precisely 4:20.

When did it first happen?
In episode one, called Shovels Are For Digging, when a businessman is running late for work, he is angry because he forgot his wristwatch and needs help knowing what the time is from a man who turns out to be the 420 man, offers him some hemp, and he obliges, bringing this fad to life.