This is something that happened in my neighborhood last year. It was a first for me. I’d seen references to it before but never actually participated in one. It’s called “getting booed” or some version of that - someone leaves a basket/bag of Halloween treats on your door, with a note that explains what to do and then you have to hang a paper on your door saying that you’ve been booed, so that no one else does it to you. Then you have to do it to someone that doesn’t have a sign on their door. It was really neat to get this surprise basket of Halloween stuff. It had cookie cutters, a candle, candy, and just little Halloween knick-knacks.
We used to do this in my neighborhood. Maybe we should do it in my apartment building this year? Good stuff!