Extroverts generally cannot understand why someone would not wish to talk. They feel insulted and threatened, and it makes them very anxious.<p>As an introvert myself, I find extroverts attempts to start a conversation to be intrusive and very tiring, so I have developed techniques to set them at ease. As I noted in another reply, Guido Menzio could have achieved perfect peace for the rest of the journey simply by attempting to explain, in minute technical detail, exactly what he was doing.