It's actually a magnet and a small metal ring in the plastic on the bottom of the cup.Originally posted by nathajw:
That's how they serve/pour beers at Mavs games, at some stations anyway. I couldn't believe what I was seeing when I first saw it. Your cup has a lil' sticker thing on the bottom of it to cover the hole.
This post was edited on 1/7 10:47 AM by nathajw