Through my ‘fitted-in-when-I-can’ Social Psychology course on Coursera, I’ve come across some interesting research into Thin Slice methodology (Ambady and Rosenthal, 1992).
Maybe you can judge a book by its cover. It demonstrates how, in less than 5 minutes, people can accurately come to conclusions about the emotions and attitudes of who they’re interacting with. In fact, just 5 seconds are all it takes to set someone’s perception of us and vice versa. A thin slice of their behaviour.