“I think we all sense that charismatic people tend to be quick on their feet. They say things that you find compelling but that you don’t expect. They come back with an entertaining answer or a surprising association, and you never quite know what will happen next. They’re interesting. It’s sort of like humor. You say something, and then I make a joke that connects it to an idea you hadn’t thought of. If I can do that quickly, it makes all the difference,” von Hippel told HBR.