Tao of Badass - Looks Don't Matter

Number One: Familiarity. Familiarity is the idea that you see someone
in the same context over and over again until you build subconscious
rapport, which is basically a connection formed on the basis that the
other person is not a psycho. You might see someone repeatedly in
the same place, or you might see them doing the same things often,
and because of that you feel a sense of familiarity whenever you see
them. You will feel very comfortable around that person and will
start to form emotional anchors that are related to them.