I have had several experiences. One of the houses that my dad rented had some bad mojo going on; there was a pentagram painted on the door of the shed out back, and when my sister and I were exploring the back yard for the first time, we found animal bones in shallow graves over most of the yard itself.
I heard my name called across the street outside at night more than once, something liked to tap on my covers when I was trying to sleep, and one got a definite sense of…ugliness, from the back bedroom of the house. Always ice-cold back there.
Insofar as a more spiritual experience goes, I had a dream once of the Virgin Mary, during a time when I was sinning a lot as a teenager and not really caring. She appeared in the kitchen, and she was crying. Her eyes were wide with sadness and grief, and she put a gentle hand to the side of my face…and I woke up.
The look on her face is still burned into memory, and it makes me want to double-up with shame sometimes. She was worried about me, really worried.