Not sure if it has already been pointed out in this thread, but anyone notice how the number of this CASA form (420) is also a very common term that stoners use when procuring cannabis from their dealer? For those who don't - type 420 into google and see what comes up, it isn't the piece of toilet paper dreamed up by the geniuses at CASA AvMed.
Maybe someone was taking the piss when numbering this form, or maybe someone was too busy thinking about something else (or already high on it).