I do this all the time jokingly. All you hafta do is press space bar the right amount of times, and it appears as though someone else has said something that they didn't. Looks like here the culprit is Dick_Puncher. Though I do it jokingly, I can understand how you wouldn't want someone out there making you look like a jerk. However, this wasn't even a successful troll. He hit space bar a few too many times