The thing I find the most interesting (and it's just personal observation of course) is that introverts get a bad rap for not liking people, being a loner, etc but in most cases where you are alone with an extrovert they seem to be the one who isn't particularly comfortable with themselves and with other people.
When you can only be with large groups of people, you don't share much and conversation is necessarily "shallow". When extroverts are one on one with an introvert, the introvert generally seems like that better adjusted, more comfortable person.