"Hm-kay"

There is something about you. The way you say "hm-kay" and open your mouth chewing a gum while giving a lecture is hard to ignore. I might be over thinking, but I suspect that you know that I'm not indifferent towards you when you look me in the eye explaining some concept. You look me in the eye longer than anyone else. Sometimes you smile and then suddenly burst into laughter after saying something you shoudn't have said in front of those 18 years old - perhaps you just forgot there's more than just us in the room. So what I do is come up with some stupid question to have an excuse to talk to you after the class. Is that sun shining on your face through the trees? Or is it my subjective reality?