Beers filled through the bottom

The Bottoms Up beer dispenser can pour up to 44 pints a minute, with just one person using it. The machine fills them from the bottom:

But how does this magical machine work? Obviously, the cups have holes, but how do they reseal? Magnets. The plastic glasses have a floppy fridge-magnet inside, a circle which sticks itself to a corresponding donut-shape strip around the filling-hole.

So, the Bottoms Up pumps are fast, can hook up to any keg and – provided you have the rest of your gear clean and properly adjusted – you won’t waste beer via foam. But there is an obvious problem: waste of those glasses. Instead of a glass glass, which can be re-used over and over, these are designed to be disposable, to the extent that the little magnetic discs are pushed as an advertising opportunity: a magnet on the fridge of the American household gets 20 impressions per day per person in the household, making this ad space the most viewed souvenir taken home from a venue. That also means it is taken home from the venue!