switched outlet boxes
I put a couple outlet boxes in my workshop that are tied to my light switch. This works out great for lights and such, but don't try and charge a plane through one of these boxes.
It took me a while to find out why one of my chargers wasn't working. Evertime I hooked it up, and walked out of the garage, I would turn off the lights. No wonder it wasn't getting charged, I light switch was turning off the power to that box.