There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns - the ones we don't know we don't know.
Madness string 81577
There were ongoing complaints to the cops about what the neighbor was doing to his goat long before the Mr Hands incident prompted my state's lawmakers to finally patch the loophole in the law that made that legal. I mean, who cares about one neighborhood of regular people here-and-there complaining about a creep in their midst?