I was just thinking if something that doesn't even register on a conscious level could have negative utility.
I guess anything with a negative cumulative effect.
Imagine the dust specks piling in your eye until they start to interfere with your vision.
Well, yes, but it's one dust speck per person...
And it's entirely possible that utility of dust speck isn't additive. In fact, it's trivially so: one dust speck is fine, a few trillion will do gruesome things to your head.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.