Okay, so this is really a thing, apparently.
At first it seems, well, silly. National Don’t Cry Over Spilled Milk Day? Really? But when you delve into the proverb we all know so well, it starts to make a little more sense. After all, a modern version of it would be something akin to “don’t sweat the small stuff.” And whose life wouldn’t be made just a little bit better with that little attitude adjustment, right?