In Japan, patrons get a little plastic basket to hold movie concession items. At the end of the movie, employees stand outside each auditorium to collect the baskets (now containing each patron’s refuse).
Also possibly related- Japanese theater floors are not sticky.
Basket pictured in front of a Terminator 4 (ターミãƒãƒ¼ã‚¿ãƒ¼4) poster