I worked at a Quiznos where we had exactly 44 trays, and we had to count them multiple times throughout our shifts to see if any had been stolen or thrown out.
My cheapskate boss made us dig through the trash to find them if any were missing. That was the only time I didn't mind seeing trays on the table--because I knew they weren't in the trash.
My sister and I are teaching my nephews to clean up after themselves in public.
It's so funny to watch other adults look on in horror as we make two little kids (ages 3 and 4) throw their garbage away and wipe up their spills on the floor.