I've been thinking about this a lot lately.
Think about emotions. Are they really a good thing? I personally feel that it is never ok for a man to cry especially in public. The world in general looks down on men that cry as weak & I tend to agree. I often fight back tears so others don't see me cry. After all I don't want to be labeled a drama king or a cry baby.
Yet when we get angry people often are afraid that we may end up going on some kind of killing spree. That person that is always happy and bubbley we look at as strange. Excitement inevitably leads to disappointment. I'm sure if you tried you could think of other examples as well.
This is why I always try hard to keep my emotions in check. I am always working towards the day of when I can kill my emotions all together.