At Classen Coffee, they do that, we usually get 2 large lattes, and add $1 or so to it, but we go there often and kind of know them. If it's a place that brings it out to you after you order at the counter, I usually do 10%, maybe. If all they do is call your name/number, maybe $1, but usually not because there's no real customer service beyond their basic job.
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