Very rarely in front of anyone, but it did happen last night and was a horrible feeling.
I was being ranted at, and everything I said was being talked over and twisted around, and I ended up just sobbing and repeating the same words over and over and over. I thankfully, do not get that bad too often. I ended up sitting hidden behind my wardrobe. It was not preventable as the individual in question was following me around my apt and not leaving even when I begged him to.
I once had one in a large supermarket also, as an adult, when I lost my bag that contained my keys, my phone, my purse... I felt so scared and the guy behind the desk said nothing had been handed in, the manager just looked at me and said there was nothing they could do and I started stamping my foot and crying. and threw my shopping across the floor of the entrance. Finally another staff member took me back to the desk and security were about to take me over to the police station about my purse, when the guy behind the desk revealed it had been there all along. He had deliberately denied it was there because I had inadvertently upset one of his work colleagues a few weeks before, by telling her the store was part of the rat race.
I used to have regular meltdowns when in conflict with my aspie ex, where I would just stop and scream and cry.
I really hate them, as they seem so unstoppable at the time.
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I am diagnosed as a human being.