...a piece of black duct tape on the light switch for our back porch. Given that I live with four other people, I figured one of us must have had a good reason to do this, and that I'd eventually find out what that good reason was.
A little later, three of the roommates were heading out for breakfast while I was making my second cup of tea. They asked me about the tape. I told them I didn't know, but that we should probably switch the tape out for something that wouldn't leave sticky residue on the switch plate.
They left, and this short showed up on one of my social media feeds:
Well-played, Roommate J. If you are still alive, that is. Me, I'll just be covering myself in glow sticks and covering the walls with LED tap-lights.