When I was younger, my parents gave me a little wine at a holiday event. Subsequently I got a tremendous headache later on that absolutely nothing got rid of. Not time, medications, dark, laying down, cold compress, nothing. The most severe headache I ever had.

But I was reading up on spiritual warfare on my own, and I thought I might as well try it as it might be demonic. I had tried everything else--why not? So I did what I was learning about casting demons out--don't remember what I did or said but it involved a lot of oral prayers, making sure I was right with God first, and filling in the space with the Holy Spirit--and the headache disappeared as quickly as a light goes off when you flick a switch.

I'm a practical and often cynical person, but I do believe I cast out a demon that day. I haven't experienced or seen anything like it before or since. I didn't tell my parents--they don't believe other spiritual experiences I've had, and if I did they'd think I was absolutely crazy. And I've shared this only very rarely, with a pastor and only a few close Christian friends.