How did you celebrate 4/20? Well, you could have lit up a spliff the size of a Volkswagen Beetle and it still wouldn't have come close to what the pothead population of Boulder cooked up. Watch in amazement as a cloud of marijuana smoke steadily grows above a gathering of 4/20 celebrants. Then watch it grow denser and larger still, as coughs and beach balls bounce throughout crowd. The video cuts off before the unruly mob discusses raiding a nearby Costco for free samples, then gives up in a moment of weed-induced apathy. But it's still pretty awe-inspiring nonetheless.