I had an interesting semi-lucid dream last night.

Basically, the scene was an old, ruined fortress, in dark surroundings under a red, cloudy sky. For some reason, I knew instantly that something terrible was going to happen (somehow, I had a vision of rocks falling from the sky, zombie-like creatures emerging from the ground, people running around on fire and the entire fortress falling about). Here's where the semi-lucid part came in. For a second I realised I was dreaming, and I had an interesting thought:

What if I became an evil character in this scene?

As soon as I said that I changed into some kind of demon - Large black wings sprouted from my back, I grew taller and felt different, much more powerful. I then lost my lucitidy and spent the rest of the dream with this altered role. Although it may sound a little weird - being the 'leader' of the nightmare, you can have some influence on how it ends out. Even in this new form I did not like the vision I had earlier, instead I toned it down and had a lot fun trying out my new form. I played out the scene but without the people, for some reason I just felt destroying this fortress and seeing what kind of things I could do.

Sounds really weird, but it turned a nightmare into a really interesting experience.