Clever Idiot Syndrome
That's me. A lot.
Despite my supposedly high IQ, if something isn't exactly (and I mean within a millimetre) of where I expect it to be, I can't see it, in fact I can spend literally months looking for it to no avail, with it sitting there right in front of my face.
My uninformed theory is that the whole concept of "IQ" is deeply flawed, and that everyone's brain is just wired differently, with some better at certain kinds of tasks and worse at others. I'm definitely with Sir Ken Robinson on that one.
Conventional wisdom dictates that I should be terrible at pattern recognition, but that isn't the case. I just seem to be better at finding things I'm not looking for. This is the main reason that I've given up wearing socks.