Butt

Please don't throw your cigarette butts on the ground or out the window of your car. Since they're made of cellulose acetate, a kind of plastic, they don't really biodegrade, and I've spent enough of my life cleaning them up off of floors and sidewalks to just absolutely hate the sight of them. In the vast majority of cases, I'd guess that you're not actually too busy and important to throw them in the trash.

It's like watching a little kid eat a candy bar and drop the wrapper on the ground for a grownup to clean up for them.