Hmm, one of the few experiences I've had that could be classed as 'Paranormal' (although I tend to remain deliberately sceptical in such things) was a really vivid daydream that I have sometimes wondered whether it was a flashback to a past life.
I was on a train heading to college, and I either dozed off, or was completely daydreaming (trains do tend to make my mind wander), and I had a really vivid sensation of being on another train. I felt as though I was seated on the floor of a rickety wooden boxcar, wearing a green uniform and holding a rifle. I later discovered this uniform to be the pre-1945 Red Army uniform. The car was packed with other soldiers who were mostly standing. My mind seemed to pick out a female soldier among the ranks as being somehow important. The door of the car was open as we trundled through a rolling green landscape.
What made this experience different from my normal daydreams was a vivid sensation of actually being there. While I was experiencing this, the memories of my 'real' life had vanished, replaced by actual emotional sensations. I remember the feelings exactly. There was an atmosphere in the air, a mixture of anticipation, excitement, pride and more than a little fear.
Ironically, I later dismissed this experience as being produced by my imagination after watching the film 'Enemy at the Gates'. There was a scene of soldiers being transported to Stalingrad, locked into an extremely cramped car, without even room to sit down. This was so different from my experience that I wrote it off as a falsification of mind. For example, the open car door that I remembered... surely people would just leave?
It was only after looking up the film on Wikipedia that I found out that the film-makers had been criticised for their somewhat 'liberal' use of historical facts (Red Army veterans even petitioned the Russian Duma to ban the film in the country). I discovered that when transporting troops, the Red Army deliberately left car doors open, in case of aerial attack. I also discovered that room was left to sit/lie down wherever there was space, as journeys across Russia could take days.
All this has left me wondering whether or not it was a memory, rather than a creation of my imagination. I don't personally take it as evidence of a past life, as I feel there is no way of proving it either way. :]