Off switch needs key to be turned back on

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Last November Crave at CNet UK posted a list of their 10 favorite off switches.

I'd like to outfit all the lights in my house with "emergency off switches" as shown here. You can turn something off by pushing the candy colored button, but you need the key to turn it back on. That way, my kids couldn't leave every damn light in the house burning, as is their wont. Link