Have you ever met anyone you felt was "possessed"?

I met a guy who seems calm and chatty with me, but with my friends he becomes very volatile (verbally abusive, violent, taking a gift and smashing it to pieces when it could have been useful to someone else). It's like he's possessed with a daemon or something. Even when he is offered a free meal he rants later about it. I'm not sure why. We're all here to help him, but there's something not right in his mind and his heart/soul is clearly uneasy. He's a veteran but never saw wartime; he's rejected by his family, which is all I know.

(He reminds me of the story of a guy who is healed by JC after being possessed and extremely self-destructive the way this guy is.)

Have you ever met anyone you felt was "possessed"?
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