In Korea, when you order Korean food from a local restaurant, they will deliver the food to you in plastic/glass dishes on a tray. Then, you pay the person, and take the food in and eat it. When you're finished eating, you take the dirty dishes, place them back on the tray, and set them outside your door. Later, the restaurant will come back and pick up the dishes from your house.
Sounds pretty crazy to foreigners!
And the food isn't expensive. Keep in mind... most Koreans live in some sort of apartment (flat, condo, apartment, studio... etc)
This idea is really cool... although it sounds like a lot of work for the restaurants. But, think of the practicality. They wash the dishes instead of creating more trash/recycleables for everyone. Perhaps it saves money. In any case, here's a picture that reminded me to tell you about this aspect of Korea.