Absolutely no where with waitstaff, bartenders, or really anyone else.  As a former waitress and bartender, finger snapping was the quickest way to be ignored.  It is the lowest form of human interaction. 

I was in a nice restaurant in DC and happened to see someone do this to a waitstaff.  What makes you think that this is a good way to get their attention?

Trust me, “excuse me” or a “pardon me” works much better.  And you’re much less likely to have anything “added” to your meal when it arrives.  

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