The most realistic scenario I can think of where that would be possible is if a kidnapper demands that you pay them some huge quantity. You both meet up, you se

The most realistic scenario I can think of where that would be possible is if a kidnapper demands that you pay them some huge quantity. You both meet up, you send them the transaction, they drop off the kid and leave, and then it turns out to have been a blockchain fork and you keep all the money. That is NOT how real business is done. When you are engaging in trade with someone, someone has to trust the other party, or you have to use escrow. Expecially if a ton of money is involved.