I'm very familiar with nightmares. Of course, I have to say the rollercoaster related one. The day before I went to Magic Mountain, I had a dream I was riding X, and my shoe was falling off on the lift, so i unbuckle the strap to put the sandle straps in the belt. Before I could buckle it, I was going down the drop and all the harnesses opened, and my strap thing wasn't buckled so mine was wide open, and i was falling out. So I have my ams wrapped around the harness and my body is dangling. Then on the top of the first raven turn, i fell out and hit a support then right as I hit the ground, I woke up.
Another one was from when I was a few years younger, I had a dream that I was walking though a corn field with a rusted, abandoned truck with a black bird on it. Then I fall into a hole thats above my head and I can't get out. So I scream and scream but nobody can hear me because there's nobody around for miles.
Another interesting one was that I was in a shipwreck in the middle of the ocean. So i'm swimming and I'm getting really tired and there's nothing floating for me to hold on to.
Those are a few I could think of right now.