Years ago when I was doing my internship, I wrote a wiki-type system to catalogue a bunch of druggable targets for a pharmaceutical company. The powers that be were impressed, but also wanted integration with one of their legacy databases that would have been a project in itself to deal with. It was boring, would have taken the rest of my time there and wasn't worth it, so my immediate boss just delayed it until the next intern rolled in.

...then the next intern rolled in, and it was delayed again similarly. And again. And again.

I believe it was delayed for the best part of a decade in total at least, year after year, simply because no-one wanted to do it. After that the site shut, the project was shipped elsewhere, and I've no idea if it ever happened!