My old
Bigfoot motorhome had a toggle switch like that in the back bedroom. On one of our first trips in it while staying at a nice woodsy campground in Michigan, I got it into my head to solve the mystery of what the switch was for and flipped it over and over and over for a long time and didn't notice a thing in the motorhome changing.
The next morning, our neighbor at the next site over (very politely) let me know that the repeated flashing of the extremely bright floodlights on the side of our
Bigfoot had made it difficult for him to
fall asleep. He was kind enough to actually laugh about it when I apologized profusely and explained why the
lights were flashing. Mystery solved!