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Google's Messages app for Android helpfully pre-populates texts like these with a "STOP" response template. I tapped it, confused, and it then *sent* the message, meaning my follow-up didn't go through and I missed my delivery. Awful UX.
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Nothing about the UI before I tapped it made it look as though the "STOP" was a template or action, I had no idea that tapping it would send it.