When I was a baby, for some reason the doctors measured my head circumference, and concluded that I either had water on the brain or an enormous head. This prompted my entire extended family to wrap tape measures around their noggins, and conclude that my enormous head was completely within the range of normal for our family.
Of course, big-headedness has another meaning, and if you didn't know me very well you might assume that while it's undeniable that I literally have a big head, in the figurative sense, perhaps my head is not so very large. I'm shy, so you might think I'm modest. This is not true. Underneath my quiet exterior (and occasional bouts of crippling self-doubt), I have a pretty high opinion of myself.
Take Poland, for example. I was confident that I'd get that job, and all I had to do was apply for it and then decide whether I wanted it. Or take the blind date I went on this weekend. I just assumed he'd like me, because I'm wonderful, so I spent the whole date trying to decide whether I liked him, which is why it was such a surprise when he didn't try to arrange another meeting with me. Is is possible? Am I not as desirable a job candidate as I think I am? Could a nerdy man really meet me and not adore me? What is happening to this world?
I know. I'm as flabbergasted as you are. Whatever. I'll just go admire myself in the mirror until the world comes to its senses.