I am constantly trying to a read a person when I first meet them. Since I usually put a huge wall and I don't find anyone that I meet very trusting, I'll pay attention to every little thing they do and say and make a decision on whether or not this person is someone I'd want to be around. It's funny how all my closest friends will adore this new guy they meet and after 20 minutes of knowing him I tell them that I don't like the guy at all. Then they're all "Oh god he's such a horrible person ;-;" three weeks later.