I had a team mate once who would go on and on and on explaining the same point over and over and elaborating a million different ways and it was extremely frustrating because not once would there ever be a break in his speech to give others the chance to ask questions (so he'd explain what we actually didn't understand) or to reply and move the conversation along. It was quite frustrating.

Many of us resorted to talking over him until he noticed, stopped, and let us reply. Surprisingly impervious to interruption.