One time I was supposed to eat a sandwich, looked down at it, and only saw a bird's eye view of a village filled with people with dark blue skin. Or woke up and saw a severed arm hanging above my doorway, started screaming (was like 6) and dad came in and walked through it, freaked me out even more :p. Other than that I hear someone snapping my name, hear a lot of thuds and sometimes what sounds like distant screams, only had one flashback though. I see a lot of things added to my view, like boxes or items that arent there, usually are in the room, just not where I saw them. Or that feeling of de-ja-vu in a situation completely new, dunno if that's hallucination. It's sort of like you either just experienced it or are experiancing it twice?