Even if there's nothing wrong with it.

Is that a thing people do? I can't even imagine the kind of self-righteous narcissism needed for it. But apparently they do! Just send it back because they're suddenly unhappy with their choice. Is that the kind of prick move you'd pull?

http://www.theguardian.com/lifeandstyle/wordofmouth/2015/dec/14/think-before-you-ruin-another-restaurant-outing-with-your-complaints