I chose to err on the side of caution and keep quiet, but this sign made me think that this is EXACTLY what a parent might say to a screaming child to scare them into being quiet (at least for a short while).
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SOUND advice. Really. Very. Sound. Noisily sound.
Have I left anything out?
Why can’t it be both sound and a scare tactic? It’s probably true. But as a parent, I’d totally use this one.