All over again.
HowStuffWorks.com, as much as 70% of the population experience this sensation. Medical science has linked the phenomena to temporal-lobe epilepsy, but no one knows why individuals without medical conditions encounter this state.
Whether a weird brain impulse or a message from lives before, deja vu can conjure up some interesting ideas. Have you ever met someone and feel like you've known them forever? Yeah, me too. Ever been somewhere and had the thought you'd spent time there before? Yup, check. Ever predicted an accident or illness before it happened? A time or two, uh huh. Freeeaky.
What about you readers? Tell me about your experiences with deja vu.