I am shaking with barely controlled rage just thinking about this one. 

What goes on in the pea-sized brain of someone who unwraps some consumable (which they probably shouldn't be ingesting anyway) and then proceeds to nonchalantly release the plastic or paper enclosure onto the great expanse beneath them?  Do they believe some twinkling trash-gathering faerie is going to swoop in and catch it before it hits the ground and then merrily deliver it to the magic land of rainbows and garbage?  No.  They think someone else should/will clean it up.  Or spout that old platitude about how one more piece of trash doesn't make a difference (they disprove this sophistry by regretfully existing--and then littering).  Or worse, they don't even care whether masses of filthy detritus gradually accumulate until eventually we must all wade through layers and layers of industrial excretions, because then our world would be a closer approximation to the substance of their souls.