Ah, welcome to my world, of having trouble thinking about something to say in the comments. [hits 'POST']

Really though, I go through that every day. If I agree with a comment, should I just write 'I agree' and move on? No. I have to rephrase what they agreed with or something, so the commenter will know that I gave it some thought. Do I just rephrase their comment, or should I write a comment that completely changes the subject?
Maybe such a study could break that writer's block, a look and a laugh at the wild world of commenting and replying. That post would probably get lots of troublesome comments tho. ;)