I once had a nightmare where I was laying in my bed listening to the TV in the next room when the news came on and the reporter had said that I had killed loads of people. At that moment I heard my mother and father, who had been watching the TV, get up to kill me. I could hear their footsteps getting closer and they were calling out things like "I'm going to kill you!" Luckily I woke up when they were at my door but the experience was very frightening.
On the lighter side I have had lucid dreams on several occasions. They're awesome!