Have you ever dated someone whom you suspected could be a future serial killer?

I liked a guy who was really into a lot of gory stuff. His dad was a doctor, so he collected a lot of photos of people with gruesome deformities and all kinds of anatomical displays. His favorite shows were Scarred and that Trauma ER show where people have life threatening injuries, and he seemed a little bit TOO fascinated the time I gashed my arm open. Also, when he was walking one day, he found a dead cat splattered on the side of the road and took a picture of it on his cell phone. He was a really nice guy, but I have the feeling I could see him on America's Most Wanted at any time. If he isn't a serial killer, he is sadist at the very least. Have you ever dated/crushed on a total creeper?