Take me out to the ballgame, but I'll pour my own cold one

Vendor hopes to offer self-serve beer in Miller Park.  (Milwaukee Journal Sentinel, 8/18/2014)

And in either case, you will never encounter a line.  Here's how they work: Fans go to a cash register, show an ID and purchase a card for $10, $20 or higher. Fans then scan the card at the machine, choose from an assortment of beer, and decide how much they want to put in their cup.