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According to the post, "you get what the person before you ordered, and the next person gets what you ordered. Thus, if you’re in on the game, you can choose to be either a generous benefactor, and treat those that come after you – or try your luck at being cheap. Either way, it’s an interesting experiment that explores surprise, kindness and encourages interactions."
There's also an interesting account of their personal experience when they visited Ogori on the post which definitely makes you realise that unexpected generosity is possibly the easiest way to bring joy to those around us.
Via - PSFK