I get it a lot, sometimes just a quick flickering of Deja vu other times stronger. I had one last week and I was about 30 seconds ahead of everything for about 2 minutes, it was as wierd as anything I've ever experienced, I could see the situation unfolding and knowing what was going to be happening/said next right upto the point where I knew the phone was going to ring and told someone to answer it about 10 seconds before it rang.
I've had deja vu many times...it's really weird, but really cool. When I get it it's anywhere from knowing what someone's going to say a few seconds before they say it to knowing the phone's going to ring before it actually does, to starting to sing a song and it come on the radio a few seconds later (that last one happens to me a LOT). And then there was the time that I had a dream that one of my teachers was going to quit, and then the next day at school we found out that she had just decided to leave without any prior notice.