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Anyone else ever done this? While drinking a cold mug of beer at the bar, the napkin sticks to the bottom of the mug due to the condensation, always have to peel the napkin off every time I take a swig. The bartender grabs a saltshaker and sprinkles a little salt on the napkin and voila, no more sticking. I thought it was a really cool trick, one less hassle in life.