It's also smart. I had a construction crew plug in to one of my plugs once, and they yanked the cord out from across the yard. When they jerked it out, the cracked a window, but even worse they shorted out the gfci and damaged the circuit. Luckily I had it on camera, and it was fixed, but it could have been pricey.
One lesson it taught me was the consequences of moving into an "under construction" neighborhood. That and all the nails in my tires.
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