Deja Vu Or What?

I wanted to write this to find out if anyone has the same thing or knows anything about what it could be. So I often have like images/speech, that I have never seen or heard before played out in my head, I often zone out and have a completely random conversation between other people I know (I am not usually involved in speaking but I have been once or twice). For example I had a kind of deja vu the other day when I watched two people have a conversation, I had that eerie feeling that I have seen the exact thing before and I can foretell the dialogue perfectly, and the times when I am in the vision I say the same thing too (confused?). However I also have dreams of things (conversations mainly) which eventually come true maybe the next day maybe in a year. I took a test recently which showed me my skills in clairvoyance were rather developed, I know quite a lot about auras and chakras etc but I really don't know what these visions are caused by, also whenever I have a vision it always happens without fail which is sometimes unnerving as sometimes they arent always good e.g. Someone dying. So to some up I was wondering if anyone knows what this is exactly, or if you yourself have experienced this:)