[Say, it isn't that bad!]

To relate a relevant tale I heard somewhere (and may be apocryphal), some soldiers had received some beer from the locals. Naturally, rather than report anything, they wanted to make sure the sargeant didn't find out.

So they hid it.

Naturally, the sargeant found every single bottle. Until he got to one room. Looked under the bed, looked in the bed, looked in all the drawers, looked in the light fixtures, etc., finally gave up and left.

The bottle was sitting in plain sight on a side-table.

And, personally, I've missed things that were three feet from my nose. Basically? What you notice is filtered through your subconscious, and if you can tell what's going on in there, you probably qualify as Trained By A Master at minimum.