In this scenario, you have neighbors who are a couple of frat boys. Once a month they throw a party. One week, the very day after the garbage is collected from your street, you're taking out the garbage, and you notice that your trash cans are filled to the brim with garbage that isn't yours. It's broken bottles, pizza boxes, the interior of a pillow, microwave food boxes. There's absolutely no more room in your trash cans, and you still have another week before the garbage gets picked up, and you have all your own garbage to put somewhere. What do you do?
Edit: KNOCK on their door