I know it's rude to order something really expensive (in comparison to the rest of the menu) when someone is treating you to dinner, but what about at a place like Starbucks? If someone is paying for you, and they get a plain coffee or tea, is it rude to order something fancy that may cost 4 or 5 times more (even though it still only costs $5 or so)? Or, for an analogous situation, if you're going out for ice cream and your date gets a scoop or two, is it rude to order something more expensive, like a sundae or milkshake?
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