As part of my 1 project per month challenge, I came up with the idea of TweetSponsor.
But I only had a few days left of the month - so I narrowed down the scope to as minimal as possible. Which meant a landing page, an airtable form for interested users to list their Twitter profiles, and a gumroad product selling access to the airtable data.
This was the fastest I've ever gone from nothing to an MVP. And it has really shown me what the M in MVP really means.