They aren't the only ones who get to show off their strength, however, a few Hashira and demons gaining that honor as well.
I agree with many great Bible scholars who do not believe that demon possession occurs on earth today.
And while we are at it I could cast some demons out of you.
There was another voice coming from, not his own, but so strangely blending with his being that it seemed to be his voice.
I got to know him one day when he was trying to convince one of the volunteers that the Earth was closer to the Sun in the winter.
But we do learn something of what it was like to be a demon- possessed person.