Yes, I have.

A woman who was threatened by me, and found a very vulnerable spot in me, and took advantage of it. (my depression) I won't get into the whole story but because of the experience, I do not trust or confide in many people.

She would do some very strange things like pick fights with people, provoke intense emotional responses, go into rages, and literally one minute later, (while the other person was still emotionally shaken from the confrontation) be on the phone with another person, light as can be, laughing, etc.

Crocodile tears, and very "contrived" emotional responses

Building up a group of allies- hate to say it, but most were not smart enough to see past her charm. Her "entourage" would come to her defense about what a "wonderful, nice", person she was, how she made you feel so special, yada... yada..
so if anyone were to speak the truth, they would be the "crazy, paranoid" one.

Very, very bizarre things came out of her mouth. She would literally clap her hands and jump up and down and say things like "that sounds like yummy fun"... things that made most people's eye roll, but her "entourage" ate it up. My point being is that her display of emotions just seemed "off" to most until you got under her spell.

Tried to become intimate with people waaay to fast.

She used pity almost every day to lure people into her web

She had secret affairs, several finaces at once

Taught a class and would simply not show up to teach, and thought nothing of it. Although people were perplexed, they regularly let her off the hook, due to her charm/ expertise in using pity, or simply denying that there was a problem with it at all.

Very irresponsible about keeping commitments.

Pathological liar, but again, most could not/would not see it, her charm would win them back within hours

I even gave her about 9 "strikes" instead of the usual 3, for things like standing me up for appointments

She betrayed me and others in serious ways and re-directed the blame back to her "victims"

I had enough and had the sense to get as far away from her as possible, but I don't have anyone else to talk to about it, as they are convinced that she is such a lovely person who had a "big heart".

ZERO integrity.

Scary, indeed. Gives me the creeps thinking about it. My encounter with her may have encouraged some of my trust/black and white thinking issues.

Ha, they DO INDEED exist! I'm so glad this was acknowledged.