Demons never have bothered me as in scared me or anything. But they love taunting. I've seen em in people and outside of people.

The evilest one I ever encountered was at a church in its basement. The church paid me 50 bucks to clean the place. Turns out they couldnt get anyone to clean it and I needed the money and the pastor got up with me.

I was alone and was down in the basement about 15 minutes when It appeared out of no where.

It looked like man at first. except it had "glowing black eyes"

I knew what it was from its energy... its unlike anything else...

it was well dressed in a suit and spoke quite proper. Told me all sorts of "gossip" about the bad deeds of the churches congregation. I told it I wasnt interested in anything it had to say. It laughed and then started telling me about physics and how light could store data not just transmit information from one point to another. but actually permanently store information and embed it on anything it touched. It said this is how lasers burn discs.

I told it to fuck off. It then got closer and told me it wanted me to attend services here at the church. I stopped what I was doing and commanded it in the name of Jesus to leave. It distorted its image into a hideous looking rat faced man thing and walked off. I finished the job and left.

I went to the pastors house and collected my money... he invited me to services on sunday...
I looked at him and said
you need to hire terminix cos you got one hell of a rat in your basement... and it likes running its mouth...

He immediately opened his wallet and pulled out a 50... and told me to not tell anyone what i seen down there... I didnt take that 50...

but they knew all about it...

I shit you not. Oddest and evilest demon I encountered. It stayed with me 30 minutes or longer... usually they bugger off after a few minutes... not this one...