Lilly- Age 3
It doesn't really matter where we are. It can be church, the store, the park, my back yard, the car- whenever one of my children raises their voice, I find myself whispering "shhh." (Not always so harsh as it is during Scarlet's nap.) Usually, my kids don't even really notice that I say it. Still, I have to remind myself that they're kids, and shouldn't always have to be quiet.
As for now, though, until I have a house full of kids who DON'T need naps, I'm fine with "SHHHH!" being sort of an extra appendage. It's like a proverbial arm i can use to reach out and smack my noisy kid upside the head without causing either physical, or emotional damage- well, at least that one is minimal.