Hmm... I've had quite a few. Several ending in my death. As a kid, I dreamed that I walked into my back yard and climbed up the slippery slide. It was a beautiful day and.. I dunno, everything just looked nice. As I went down the slide, I saw a giant, green cartoon snake at the bottom, with it's mouth side open. I slid into and saw darkness, then woke up.
Much more recently I fell asleep watching an episode of Daria on DVD. There was something about mice in it. I think they were doing an experiment for school. Anyway, from hearing about the mouse all the time, when I fell asleep half way through the episode, an owl was in my dream, swooping down to pick up a mouse, then it started attacking peoples faces, stealing and swapping them with other people faces.
I've also been killed by a girl I had a crush on who also turned out to be an alien that tried seducing me like the one in Species (Sil, I think her name was), then turned into a car, just like a transformer and started chasing me, trying to kill me. There was also something about Epona's Song from The Legend of Zelda.