I've had deja vu a TON. Plus, (I don't know if this is a hallucination but it kinda seems like it) when I was just a little kid, when my mom went to say goodnight to me, and when she was walking out of the room, I'd close my eyes for a second and she'd be all the way downstairs. O_o
On a cross-country trip I went on, I tried to sleep in the car one night, and I had all these wierd hallucinations of black and white things in the sky that looked like UFOs having some kind of seizure, they were moving around so fast. XD