Ok, I'm going to have a go at posting an observation. It is relatively small but I'll tell you about it anyway. 

This happened a while ago and it involved a male friend. Just to be clear, I have no romantic feelings towards this person nor am I attracted to him in anyway. We are both happily married (to other people) and tend to hang out more as couples and families. I am probably closer to his wife than I am to him.

Anyway, it was a sad occasion as we were attending a funeral of one of his wifes elderly relatives. It was not someone who he was particularly close to so I expected him to be serious but certainly did not expect to see anything remotely like crying. Due to the nature of the event I wasn't particularly looking out for it either. He is also a business man and quite stoic so not someone I would ever expect or even imagine to see cry.
At the end when we were all outside chatting with the family I caught sight of him and noticed that everytime someone went over to shake his hand his eyes filled up and his bottom lip trembled slightly. It really surprised me and I was stood quite near so I went over to him. The tears were still in his eyes and his lip was still trembling intermitently. I have never hugged this guy in my life and only shaken his hand and maybe given him a quick peck on the cheek when saying goodbye after evenings out/parties etc, but I just couldn't help myself and I flung my arms around him! I held him for a few seconds and he readily hugged me back. When we let go we stood and talked for a few minutes and then he was ok.
It is only a small observation as no tears actually fell down his cheeks but it was clear he was very emotional, far more than I expected, and although I am not attracted to him at all I get a nice warm feeling when I see him now.