[MrYorkiecrazy]

Many years ago, we had a Cocker Spaniel named Buzzby. She was very sweet, gentle, and calm natured and hardly ever barked.
She slept on the foot of the bed and one night, suddenly stood up, the hair on her back standing up, low growling, and looking down the hall. We were reading so we saw the whole thing. We could also see there was nothing down the hall.
But, looking at the back of her head, it appeared she was following something coming towards us, then into the room, then turn and walk along the foot of the bed, then into (and through?) the outside wall. After staring at the wall a few more moments, she curled back up as if nothing happened.
It never happened again.

Oh, I love this thread.