Lliam doesn't like being alone. This weekend Will and I got tired of him following us everywhere in the house and explained to Lliam that he is an extravert because he always likes being around people, and that his mom and dad are introverts because we like being alone sometimes.
Later that morning, Will needed to change his clothes so he closed the door to our bedroom with Lliam on the outside. Lliam proceeded to cry the entire time: "Let me in! I'm an extravert! I need to be with people!"