Yes, I've known several over the years. Don't know any now as I can spot them and swerve.
First one, a boyfriend (early twenties), very manipulative, charming, fantastic at weighing people up instantly and seeing how they could be used to his own ends. Very money-focused as was his father and never appologised even if caught and shown evidence. Would steal, lie, cheat and belittle for personal gain or just amusement. Met his match I believe in late 30's following a run-in with a female psychopath who completely wiped the floor with him. I met her once. She was terrifying but very glamorous/attractive.
Second one, I worked for briefly (8 months) he was CEO of a corporation and lived to belittle people and would rub his hands with glee at the prospect of making people cry, sacking them (this was early 80s) pitching one against a colleague and being a general shit. Treated his wife and sons terribly and enjoyed their hurt (kept them in line you see). If I'd known before I got the job I would have bolted. When I left, I heard on the grape-vine that he'd told people I had a drink problem. People thankfully know me well enough to know that's not true (I hope). He also forced suppliers I had hired in my new job to stop working with me. He's retired now thank god.
Third one was a woman I worked with. Very beautiful, life and soul etc.. very manipulative and would gather information on everyone and use it against you to cause drama. Would lie, steal, cheat and deliberately wreck people's careers, chances of promotion (think destroyed work, forcing an 'accident' or 'incident' with hold information etc).all for the joy of hurting people and getting ahead. She's moved around so much it's hard to keep track of her but I believe she's in Milton Keynes now with a new boyfriend.
The problem with these people is that they are so charismatic/attractive. It's only once you get to know them that you see the full horror.