Since this interation of the forum is about to go, I might as well share this here. (I'm copying some parts of this from my blog, with changes for clarity.)
If you've read my posts for any length of time, you'll know that my brother seems to attract all sorts of weirdness. His vardoger appears fairly frequently. It's long been a family joke. However, the thing that happened this summer was startling even by those standards.
It was about 6 PM on the 21 of June. It was getting toward evening but the sun was still up and the light was good. My brother had just parked his truck in the driveway and was walking toward the carport, a distance of appx. 15-20 feet. I noticed someone walking behind him.
I was standing on the lawn maybe 40 feet away, wondering who was following. For a moment I thought it might have been my elder son, but that didn't seem right. They have a similar build, but a different walk, and besides, the following figure was dressed like my brother. I blinked. Could I be seeing double? But my vision was otherwise fine, and what's more, the follower was moving at a different speed. That's when things get weird.
My brother was walking the way he normally does, but the figure behind him was trailing much slower. Indeed, I was put in mind of frames of a film being cranked slowly through a projector, with the following figure seeming to fade out just toward the end of the frame before appearing in the next. It was very, very odd. I watched their progress into the carport, then had to go think it over. Despite the jokes about my brother bi-locating, I'd never seen anything like this before, let alone his Doppelganger appearing in the same place at the same time.
What to make of this? Well, there is a medical condition that can make things appear as if in slow motion, but as far as I can tell, it doesn't isolate one object, nor does it come and go in an instant. Not very likely the explanation in this case. No more likely than an honest-to-goodness Doppelganger, in my opinion.
To see one's Doppelganger is a bad sign. To see it following your footsteps is even worse. I decided to say nothing to my brother - no sense in alarming him if it did turn out to be some quirk of my vision.
Early the next morning, though, he had a strange story to tell
About 5 AM, he was awoken by someone opening the door to his trailer and motioning to him to come with them. He thought it must be one of us, but it was dark and he couldn't see well. He told the person he'd be a minute, got dressed and came into the house. But we were all asleep. It was none of us who'd done it.
...
My brother's health was fine at the time I saw the apparent Doppelganger, but in early October he suddenly fell ill and was rushed to the hospital and put on life support. After multiple surgeries he has survived, but frankly is not doing well.
I did stick to my pledge not to mention the Doppelganger to him and I don't know if it could even be considered a bad omen after 3-4 months had passed. But still, I think about it a lot. I might have just dismissed it as some quirky hallucination if it hadn't been for the person at my brother's door that night.
Oh well. That's the story. Make of it what you will in the time the forum has left.