I don't generally have heated, angry things to say in response to threads. I do just sort of stop in mid-post-write-up and leave the thread without posting sometimes, though.
Have you ever browsed through the forums and see a few threads that kinda angered you but you know deep down the best thing to do is just walk away, cause god knows if you post in them all hell is going to break loose? :mog:
This happens in the staff forum now and then. Only, I post in them (or possibly am the one to make the threads) until hell breaks loose, then I sort of quietly just move away while everyone poops on what I said. It's a fun process.