Opposite ends spectacularum

It has come to my observation that no two people can feel the way at exactly the same moment. For example if one person is happy, then the other person is sad or upset. If someone is in a good mood, then the other person is in a bad mood. I think you can get the picture unless you are with someone who are understands then you will have to wait until that person fails to understand something.
I have always promoted this theory of opposite emotional sides. I also have wondered why this is. Is it because emotions are like masks, so only person can wear one at a time? Or is there an emotional limit? Maybe people's biological clocks have emotions and people with different time zones are the only ones that hang out.
I suppose a lot of things occur if the opposite exists. One that I can think of is when I am talking to someone it seems that they are not interested. If I have something to say to someone, then I get the feeling that the person is thinking "Go ahead and get to the point and get out." Or maybe people share what they feel is important so back to the opposite no one else cares.
This also leads to the point that if one is trying to hide something then someone else is really interesting that "story." It seems everyone is most nosy when you feel it is not important or it happens to be embrassing.
Well since I cared enough to write this down, no one will care enough to read it.