It depends on the situation for me. If I see that the person is yelling at me because I really did something wrong, I will apologise sincerely and agree with the person that I should not have done that, that I was not thinking, and say things that will hopefully calm them down.

If they scream at me for some strange thing unrelated to me, I would say, "I understand, I am having a weird day too, and I don't feel good. It's been the third Monday this week. We both need some chocolate, doesn't that sound good?" and hopefully the person will realize that his anger is misplaced, without embarrassment. I can usually smell someone else with PTSD, who is angry about something that has nothing to do with me, but is venting in my general direction.

I never tell the screaming person to calm down or lower their voice because when some stranger tells me that, it makes me angrier. It's about as successful as stopping a burp or fart midway. That person needs to get it out. I just look at the person and nod my head yes. I know that when I get upset and yell, all I really need is to unload my anger for a few minutes, and just seeing that one other person sees my point of view is satisfying enough to make the anger leave me.

I am talking about yelling only, not hitting walls with fists, or throwing things.

When I get angry and loud, my husband speaks to me in a quiet voice, very calm as if we were in a library, and for some reason, that makes me lower my voice too. I can't hear what he is saying over my own yelling, so I have to be quiet. He's really good at 2Quilt management.