Scariest dream I've ever had:
My brother, nephew, and I are out driving during very heavy rain. My brother's driving, I'm in the passenger seat and my nephew's in the back seat. I don't remember where we were going but that wasn't really important, just that we were on an overpass and visibility was zero - all I could see was a sheet of rain. My brother starts screaming that he can't see anything and at that moment the car veers off the overpass and after freefalling for a few seconds, we all start screaming. There's a loud crash, everything goes black... and at that moment I wake up.
I stayed up a few minutes and then fell asleep again. This time I dreamed the three of us were driving again but this time I was in the back seat listening to my brother and nephew talking. We were driving through an underpass that seemed a bit too familiar to me. All of a sudden my brother spots an accident and stops the car. We get out to see if we can help when my brother notices the car in the accident is just like ours.
At that point it hits me - I fall to the floor and shut my eyes tight and scream, "Don't look in! Don't look in!" over and over.
The dream ends with my brother screaming in horror "OH MY GOD! IT'S US!"
That's about the time I wake up screaming covered in sweat. I didn't sleep at all that night and hard a really hard time sleeping for a week.
Totally a true story. I'll never forget that dream, like it's burned in my mind. Every time I tell it, the hairs on the back of my neck stand up.