I used to fool with what could be called "spiritism". I did feel something. Sympoms included pain in my lower back, and rapid heart rate. I don't remember exactly what caused me to stop, but I do recall I got scared, and I knew I didn't want to "open that door" anymore.
I wouldn' call it a "demonic incident", but it was strange.
If you google Nina Kulagina, I believe she was for real.
HBH