When I was about 20 I was working for an air charter company, Tillair/Airnorth.
I had a dream one night:
"I dreamt that one of our aircrafts (BEK) caught fire and crash landed. My dream was very specific - I said it had school children on it and it was a charter out of Darwin. I knew it crash landed in the bush, but that everybody on it was ok."
As luck would have it I actually told the girl I worked with, because you can't imagine my surprise when that exact series of events occured about 1 month later!
Is that freaky or what!!! That was the most dramatic "preview" I've ever had, but I have had a few other things happen that have made me go "WOW". Of course there's the telephone stuff - I often know who is ringing before I answer it............so sometimes I don't answer it!!!