There are places in North America where you can stand in Canada and the US simultaneously. A massive, historic home straddles Stanstead, Quebec and Plain, Vermont, for example. You can enter the house from both countries.
If you hand out candy for Halloween, this information is probably too late for you. (And you ought not feel guilty about that!) But if you eat candy, it’s worth knowing that like so many things before it, candy can be made from ethically and unethically sourced ingredients.