I've had a few very vivid, very strange dreams right before bad things happened. The first few times I tried to explain it away as coincidence, but the last couple of times it's getting a bit hard.
The first one I remember was when I was about 10. My DGP's had very good family friends named the Walkers who we saw all the time. I dreamed a night or two before Easter that everyone was sitting around the table at the Walkers house, my DP's, my DGP's, my DB and I and the Walkers, all except Mrs. Walker. I asked in the dream where Mrs. Walker was and her DH said that she'd died. I woke up shocked, but thought it was just a weird dream. She collapsed and died suddenly while serving Easter dinner. My DGP's were there, but we weren't. I passed if off for years as a coincidence.
Next was right before I started Uni. I had a dream that I was in a plane crash. I was standing on the beach and people were screaming. There was fire on the water and people were looking for survivors, and I remembered the sensation of the plane crashing and then being on the beach. Two or three days later a plane went down into the ocean about 2 hours from where I lived and over 200 people were killed. People saw the plane go down in flames from the shore.
I had a lot of dreams about burning buildings and crashing planes in the weeks before 9/11.
I was supposed to go to Thailand for a week in January 2005. Just before Christmas I kept having dreams that I couldn't go because I was trapped underwater. Tsunami hit on Christmas Eve and the trip was cancelled.
My DGM was diagnosed with cancer and died within 2 weeks about 9 years ago. While I didn't have any dreams about that, about 8 days after she passed (I was overseas and unable to get back to be with her) I had a dream that she was sitting on the edge of my bed in my apartment, that she had never seen, with my soon to be DH sleeping next to me, and she told me she was ok and that my DGF would be with her very soon, and she knew I loved them but that I musn't be upset and sorry she missed the wedding, then she gave me a hug. My DGF died less than 2 days later sitting on his chair.
Had a bit of a tiff with my BF about 2 years ago and we didn't speak for a week or two, and then I had a dream that I was at her funeral and crying. I woke up the next day and sent her a message. She never responded and I was wondering what I should text her next to try and apologize. Her DH called me that afternoon and told me she'd passed away from heart failure in her sleep the night before.
I've also had a couple weird experiences of seeing vague dreamy "people" standing where they'd died, once in a bathroom in my uni (girl had hung herself several decades before from the rafters) and the other a young man standing and looking at a cross put up by Mother's Against Drunk Driving.
Thing is this all runs in my family, my DM, DB and my aunts and uncles have had similar dreams and experiences. My DM kept telling me she was having weird dreams that I was going to go into labor while she and DF were in Malaysia, and kept waking up in the middle of the night waiting for the phone to ring, even though everything was fine and I was still 3 months from DS being born. He came early, 2 days before they were due to return and I had to call them in the middle of the night.
My uncle was in a horrible accident where he lost both arms (he was an linesman with the power company, went up to do routine work and asked the guy back at the power station if he'd turned off the power to the area, the guy was drunk and said yes, but actually he hadn't). He remembers nothing after the electricity got him except a dream that he was sitting next to his hospital bed looking at himself with no arms, but he was holding his daughter (who wasn't born until a week later and he didn't know it was going to be a girl), and a voice said, you can't give up (daughter's name) needs you. It was tough and he thought of suicide a lot during the years after, but the dream kept him going.