Welcome to the forum
Firstly, as Coldethyl suggested, memories from a long time ago can be clouded and shook about sometimes, so there's the possibility it was formed from a fragment from a tv show, dream, story etc and built up with the emotions. Though conversely, a memory such as that seems very peculiar and sometimes they stick in the mind for a reason. If it is indeed true, or has a slither of truth, it is very odd!
There are continually reports of doppelgangers that are observed, many swear to have seen themsevles o_O Sometimes there are 'crisis apparitions' which appear before or at the moment of a loved one's death, if the viewer is not in the same place as that person. They seem similar to ghosts except the subject is living at the very same time. If not tied to death, it could be a parallel universe where we also exist that is for some reason overlapping or it could be time replaying or maybe a shadier option of some interdimensional being having a creepy joke, who knows! Thanks for the tale!
Edited by DancingCorpse, 12 December 2012 - 11:22 PM.