Massimo Bottura's lucky accident
Watching Chef's Table on Netflix, episode on Massimo Bottura. He tells the story of creating the dish "Oops I dropped a lemon tart". They have only three lemon tarts left, and they're about to serve them when his co-chef drops on. That's when Massimo realizes how amazing it actually looks like that, and they end up recreating the other plates like that.
I love happy accidents. Happen all the time. We just have to be open to them. Of course, our first instinct is usually to beat ourselves up over it, which ensures we get zero benefit from the happy accident and it just becomes an unhappy one.