I 've used the search button but I couldn't find a topic about "Wanting a nightmare."

So my question is... does anyone know how to trigger a nightmare?
My reason for this is because I want to see as another technique into lucid dreaming just for kicks. If you start out with a nightmare ( as a intent) and than see if you can go lucid . Because no one has the idea in mind to have a nightmare they just happen . But I was wondering if anyone has any tips on triggering a nightmare.I thought about watching a scary movie thinking of something scary but know one has never tried to have a nightmare. So just wondering if anyone had any ideas?

hope that made sense :S