What's a 'this idea is so dumb, writing it anyway' story that you have written?

[Naruzeldamaster]

For the record, I mean 'dumb' in the way that 'why would anyone write this and why do *I* want to write it, but it sounds fun' rather than the actual idea being stupid.
After all, an idea being 'dumb' doesn't mean it's bad, it just means it's a project explicitly for you to enjoy writing and those are fun to write.
Second: technically there are no 'dumb' ideas unless they're executed poorly, at least I think so.