Ask HN: What are your best ideas you will probably never build?

I think a lot of people here have ideas they keep thinking about, but realistically will probably never build.

Maybe they are too small for a startup, too weird for work, too niche, too much effort, or just too far down the backlog.

I wonder if it would be fun to have a thread where people pitch those ideas.

If you have something you would like to see exist, but probably will not build yourself, post it here.

Could be software, hardware, data, art, local tools, research, weird experiments, anything.

I'm curious about your ideas!