If you need to go to the bathroom or smoke at a bar, placing your coaster on top of your drink is universal bar language for, "I'm coming back." Prevents you from losing your drink and seat.
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Bar Drink and Seat
If you need to go to the bathroom or smoke at a bar, placing your coaster on top of your drink is universal bar language for, "I'm coming back." Prevents you from losing your drink and seat.