Surprises come in many shapes and forms. Accepted. But when it's out of the blue...that's a fucker! Sometimes you surprise yourself with your abilities and sometimes with an unknown weakness - the same one you were convinced you weren't capable of having. What we don't know about ourselves, when revealed, can be a pleasant surprise or can be surprisingly unpleasant to deal with.
Do you really know the other person you deal with every day well enough? Have you ever had someone close reveal something that made you stop in your tracks and ask yourself: "Who is this?"