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It's a meme - it's a way of saying "this is really unexpected; we live in unpredictable times".

Yea, specifically that prop-bet bingo cards are usually constructed that every line you could make includes some rare thing so that you don't just easily win with 5 obvious things. So if something happens that's "not even on my card" then the implication is that it's so crazy that someone wouldn't have even put this down as a "this will never happen" option for betting.

Ah, thanks.

It's usually metaphorical, but here's somebody that made a generator-https://www.reddit.com/r/Buttcoin/comments/ywkjy1/bingo_card...

You make your own! I may or may not be guilty of making a few in the time leading up to corporate town hall meetings at a former employer. Just pick out management's favourite buzzwords and projects du jour, randomize the layout, CC your office buddies and see who wins!

I usually make one in paint during the annual "where the vendors talk at us for two days" sales thing at my day job.

> Sorry if a stupid question, I'm assuming it's a blockchain thing.

That's an interesting idea. Build a smart contract which can issue bingo cards and keep track of it publicly.