Turning Off the Lights
Ugh. Being a child of the 70s, we “reduce[d], recycle[d] and renew[ed]!”! And so, when I saw a light switch ON, as we all scampered to our sleeping bags, I flipped the switch OFF.
And during the freezing temperatures of the night, because I turned off the heater on our hostess’s greenhouse, I inadvertently killed all of her treasured plants. I think I was 12 or 13. That’s a long time ago. Story credit: Reddit / SBG214