I've always been the kind of person who easily gets tuned into other people's "vibes." What I mean by this is that I tend to pick up and easily recognize on the energy that they are putting out. I'll easily sense if others are happy, sad, stressed, pissed off, worried, or excited. I also get a different kind of vibe if someone is being genuine or if they are trying to hide something.
We all do this to some degree. Some may be just more sensitive to it than others or we may be more "in tune" in some moments and not so much in others.