Introverts: These are usually people of high intelligence who prefer their own thoughts to listening to a bunch of babbling idiots. They tend to develop close relationships with other bright people, and often decline social invitations from oafs.

Extroverts: These are usually people of average or below average intelligence who have difficulty learning new things because they seldom shut their pie holes long enough to hear what others are saying. They tend to share their ignorant opinions with everyone they meet.