Yeah, I know that a ban on chewing gum has been criticized as an oppressive social control, but I still applaud their efforts in this realm. It's only fair that I tell you that public gum remnants are one of my pet peeves. I hate walking down the street and seeing the sidewalk spotted with little black circles, every one marking a place where someone spat out a chunk of chewing pleasure sometime over the years. I imagine these rogue chewers lurking, waiting for the right moment to drop their spent wad. Capricious one and all, they revel in the idea that someone walking past after them will have to deal with that sticky mess on their shoe.
(More likely, they are being careless or just plain old lazy, but this is my fantasy.)