So I'm sitting in an Irish pub in Lancaster, PA. Went outside for a smoke. Put a napkin atop my freshly poured Jack on the rocks to signify my return. I got back and my drink has been dumped and my seat was taken. I asked the keep where my drink was and she said that placing a napkin on your drink means you're leaving. Turns out the guy whose wife was in my seat told her this. He said in Lancaster that's proper bar etiquette.
What say you?
What say you?