RE cinema special snowflakes, some of the messes made were horrific at the cinema I used to work out.
One of the most bizarre things, which happened repeatedly, was people would stand up, let their seat swing closed, and then WEDGE their rubbish in between the two halves of the seat. Often, this would include popcorn boxes and drink cups with remains still inside, so if the staff didn't spot them, the next person to pull the seat down could end up with their shoes sprayed with popcorn and sticky soda.
We never could understand why people did it. We accepted that people left their rubbish on the floor - at least then we could see it!