A passage from Doogie Adams' Dirk Gently's Holistic Detective Agency:

Well, he's one of those people who can only think when he's talking. When he has ideas, he has to talk them out to whoever will listen. Or, if the people themselves are not available, which is increasingly the case, their answering machines will do just as well. He just phones them up and talks at them. He has one secretary whose sole job is to collect tapes from people he might have phoned, transcribe them, sort them and give him the edited text the next day in a blue folder.

I swear I work with two or three of these types. It's my own fault for being such a blasted good listener.