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Well now that the subject is at hand, perhaps someone could tell me when I would get to smash my empty glass into the fireplace. Now that is a custom!

I don't know. I hear that it is just bad luck to leave the empty on the table, kind of like giving flowers in even numbers is bad luck.

Be prepared to take your shoes off when going to visit someone. I know one guy that received a stern brow beating for reclining on his own hotel bed with his shoes still on by one of his guests. Oh...