This is a weird variation of the party foul, and it kind of makes the term more literal than it has any business being. At a Clinton LumberKings and Fort Wayne TinCaps battle over weird capitalizations, a fan caught a foul ball in her beer and did what any self-respecting baseball fan does: She chugged it. Obviously most fans want to enjoy their $14 beers, but when duty calls duty calls.
Glossing over the TinCaps logo because that's very much not the point, she couldn't even be bothered to take the ball out of the cup. She downed it while the guy she was there with just applauded, blatantly not sure what to do with himself in the situation.