Do you post a reply before reading the responses?

Before I post I check the OP, first page and the last page of comments, just to make sure that the thread hasn't gone off into a whole new conversation before I write down my thoughts. Then after I've posted I'll read the rest as I try not to be influenced beforehand by what anyone else has already said. Obviously if the thread is 100 pages long I'll skim through and read every other page etc.