Dr. Raymond Moody explains the Psychomanteum from inside one 

I think I will give it a try one night.

We were living overseas in the late eighties. No phone in our house..We used landlords. I received a call from the states and went to use the landlords phone. There is mirror above the phone. As I looked in the mirror I saw my grandmothers face. My grandmother had not passed but had Alzheimer's. My grandmother was very religious. A year after she passed I had a dream where she came to me and waved her hands like she had cleansed me. I know now that after I was being baptized she was trying to do that.

I made one of theses but was to chicken to do it