I only ever have lucid dreams so I don't really have nightmares. The "bad" dreams are just really annoying! I'm usually chased by something and have to imagine barriers to stop the creatures/people/thing from capturing me.
I would thus classify them as "boring/annoying" dreams rather than nightmares.
I once was chased by Eminem with a chainsaw through a hedge maze, got cut up, put together again and we became best friends
Oh and American horror films are total crap to me. I find Japanese ones hell scary. I get paranoid after I watch them and cannot be alone though I get over it after in a few hours. I need someone to watch with me
Although they all suck without sound.