Do you do something different whilst eating out ?

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My friend doesn't like ice, his teeth are sensitive and it hurts them. I like ice, but my teeth are also sensitive. I don't drink things with ice often, most of the time it's water. Going out, my friend and I both ask for no ice in our drinks because it's easier. We also tend to order the same drink so that it's easier to remember, and the waitress can write it down in one swoop. Do you do anything different in a restaurant that you don't normally do at home, and is it for convenience of the waitress, yourself, or for what?