Tears are an interesting part of the human body, emotions, and therefore, life. I inherited (or learned) from my mother to cry with tears of sadness, pride, happiness, love, or any other emotion. My tears come easily and they are always honest. There is no "show" about them.
I found this article to be most fascinating. I hope the photos show up well enough on this blog for you to distinguish them. Here is the link to the article: http://frame.bloglovin.com/?post=5685308907&blog=3114621&frame_type=none. There are tears of anger, grief, joy, and many more.