These next two work together, and they both have exceptions, but let's start with the Interrupter. In his simplest form, the Interrupter is merely rude. He cuts you off or changes topic just because he's a self-centered douche who hasn't been properly socialized. I don't have a lot to say about that kind of Interrupter.
"You don't? Good. That gives me more time to talk about me!"
But there is another kind of Interrupter who's a lot harder to define. He's the clarifying kind of Interrupter. There's a good chance he is paying attention -- even actively listening. He's not interrupting so much as clarifying. See, he wants to make sure he gets every vital detail so that when you get to the big finish of your story, he gets it. I can appreciate that. Sometimes, I'm even the Clarifier, because I don't want that whole story to get told with no payoff. And sometimes, especially if you're dealing with a weak storyteller, the Clarifier can be helpful for all. For example, someone might be telling a story about how some woman in a crowd was describing the shape of the birthmark on his ass without ever first explaining to his audience that he went to the Thanksgiving Day Parade without wearing pants.
But more often than not, the Clarifier is asking for clarification on worthless points that are completely irrelevant to the story.
Your Story: Did I ever tell you guys about that time I got a Mercedes-Benz for free? Oh, man, you won't believe it. OK, so I was in Bethesda, Maryland, to visit my aunt, and-
The Clarifier: Wait. Father's sister or mother's sister? Or by marriage?
Your Story: What? Oh, father's sister, I guess. Anyway, I got lost on my way, so I drove my shitty 1988 Honda Accord into this dealership just to get directions, and-
The Clarifier: Was it an automatic or a shift? I just want to make sure I follow ...
Your Story: Automatic. It's not important. Anyway, this salesman takes a liking to it. He apparently has been restoring a 1988 Honda in his spare time, part by part, because, and I shit you not, that's the car he lost his virginity in, and so he says-
The Clarifier: In Maryland?
Your Story: Yes! Who cares?
The Clarifier: Sorry, go on ...
Your Story: Nothing. He just gave me a car in a straight trade and blah blah whatever. I have to go fuck your mom now. Your mom in Chicago. I'm going to use Trojan condoms with spermicidal lubricant. I'm going to take American Airlines to get there and probably sit in business class. She'll reach orgasm in four minutes and nine seconds. OK? OK?!