^^^ there's way too many explanations for deja vu to credit it to a sixth sense.
But I do think that everybody has a little psychic sense. I know personally, my intuition is very strong, and when I don't listen to it I get into trouble. Last time I didn't follow my gut (in December) I got arrested. I think some people have more psychicness than others but it exists in all of us. Not all of us can see the future and shit, but we all have an ability to sense danger somewhere inside of us.
You ever got a blast of adrenaline for no reason? Like you were just chillin with your boys, and all of a sudden it's fight or flight, and right as you feel that you look over and see some five-oh's?