Re:Anybody Know a Method to Frost a Cup With Ice?
Back when I worked in a pizza place, we used to keep the beer mugs (plastic, but not disposable, pretty thick) in the freezer. When they were in the freezer they looked normal, but as soon as you pulled it out and started to pour the beer, moisture from the air around the mug would condense and freeze to the mug, frosting it. No contraption required. That being said, I have no idea if a thin disposable cup would retain enough cold to do the same thing.