If Dogs Can Smell Cancer...

Sometimes, when I'm on my own, an empty section of air will mysteriously seem to gain occupancy. I'm not sure whether it's a reflex from my days as a devout Christian when I struggled always to feel the presence of the Spirit, or if it's the early manifestation of some really fun type of dementia.
God, ghosts or aliens? Perhaps I'm sensitive to something on the peripheral of 'all this' the way that dogs can smell cancer...
I'll probably never know. At least I can get myself good and creeped out for no apparent reason. *sigh*