 If it's a beer, why would we be putting it in the cup in the first place? Oh, I see. Just take it right from the bottle. Yeah, you don't have one of those fancy people who pours their beer into a glass. Eliminate the problem. Drink the beer from the bottle. Gotcha. I agree with you in most cases, but I would be curious to see if this does work on beer as well. Well, now I want to try it, of course.