Favorite Book Idea That Won't Go Anywhere

A short break from the incessant "FiRsT tIeM rIgHtUr TeLl Me HoW dO sTuFf" that pop up in our feeds every twenty minutes or so, if you'll humor me.

I'm sure many of you keep a log of story ideas that jump into your head. Inspired by real life events, dreams, song lyrics, etc.: doesn't matter where you get your inspiration; when an idea sticks with you, you consider it like anything else you've written.

The question I have for you is this: Do you have any that you like as concepts but are just so absurd that you'll never be able to bring it to fruition?

For example, I have a story idea that I really like wherein deities from Earth that are no longer worshipped (conceptualized in a creative pantheistic sense) seek to create their own life elsewhere. It devolves into a series of games between them (like actual board games) played with alien lifeforms while following a primarily comedy-driven narrative.
I was under the influence of many different drugs that night, but it's still a compelling idea, if a tad ambitious. I'm a fantasy and sci-fi writer, and I do know more about religions (living and dead) than the average monkey, but the comedy bit is where I want to keep it but am falling short.

What do you guys got?