I grew up being hyper-aware of everyone around me as someone who observes people on her free time. If I want to know someone's real emotions, I tend to read their eyes. If I want to know someone's intention, I tend to observe their body movements. If I want to know someone's reaction to something, I tend to focus on how they react verbally, and how it differs from how they talk naturally. As time goes by, I adapted this hobby too much to the point where I tend to catch myself doing it unconsciously.