Yes, it happens all the time
Yes, occasionally. And I always regret it!
Who hasn't, at some point or another?
I don't, but I am unfortunately well aquatinted with a DDO sociopath who does.
I try to stay off the phone & computer, when I'm angry.
If I post something random or stupid, that isn't in a PM, then it was on purpose. I don't post while I'm angry. It would have the same effect as when I post while I'm overly excited. Which is to say it would be an overly long rant. Only ... not as pleasant to read.