“There are known unknowns. That is to say, there are things we now know we don’t know. But there are also unknown unknowns. These are the things we do not know we don’t know.” -Donald Rumsfeld
The unknown unknowns are like surprises and mysteries. It is unexpected. We never know what it will be or what to make of it. It’s like cutting into a cake, only to find something totally unexpected in it. I mean, who would’ve thought that there would be a bunch of candies inside this cake?