No. That would be In every thread someone has to be last, so eventually everyone gets a turn. The idea here is that it's a thread in which every post is categorically last. Think of it horizontally rather than vertical.

It's appeal is that usually when one does have the last word, when someone is last, there's no satisfaction in it, because it probably wasn't intended. One feels simply that one has killed the thread. There are exceptions--some people seem to always post curt last-word sorts of things--but these never turn out to be last.

So, for example, descending from several threads about movies, Oliver Stone sucks.