Ideas that won't leave you alone

I've got an idea niggling in the back of my mind. It's not complete enough to even call it a scenario - more like a set-up that could be fleshed out into a scenario. No characters, no plot, just a string of events.

Who's the lead? What's the objective? What's the conflict? What's the knockout?

No idea. Maybe I should write it down and find out.

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