On a similar topic, I’m often amazed at how people choose to dispose of used Kleenex on flights. I’ve often seen them stuffed into seat back pockets. In one case, I watched a person throw them straight on the floor after they used them; by the end of the flight, they had a little mountain of white by their feet. One of the flight attendants picked them up off the floor when they came around collecting trash before landing and was far more gracious about it than I would have been. I’m continually amazed by what some people consider appropriate behavior for shared, public spaces