I am sure that you have lived in a neighborhood that has this fun tradition. It's called being Booed if you haven't. This is a fun tradition where neighbors get to secretly share yummy treats with each other while being sneaky. My kids love it and are excited to start it this year.
Here are a few cute Booed instructions and pictures that I found. I am sure that there are many many more, but these were some of my favorite!
And just because it looked like fun I made one of my own that you can just click and save to your computer. Enjoy!