I was in Korea several years back, and they had an innovation that anyone with working experience in fast food could appreciate: Built into the garbage cans at places like KFC was a hole to pour the remains of your soda into, so later on some kid didn't have to delicately move a garbage bag with two gallons of liquid in the bottom of it.

We can't have that in the US because it would take about 30 seconds for someone to plug the hole up with garbage.