He would walk around the streets all day, yelling, and swinging fists exactly when someone passes by him.

People from the neighborhood know him, and are not afraid. He never actually hits anybody, no matter how near his fists come to you.

One day, I saw the guy passing near the photo studio in my building, and the fake Santa that works there said something to him. Our crazy guy stopped and they had a conversation. I was passing by, and from the little I overheard he sounded like a completely normal person. Totally not matching his everyday crazy behavior.

I have no idea what made this transformation possible. My theory is that the Santa guy was probably a neighbor of his, and knew him from before he went crazy.

I read the whole thing and I'm still not getting it.

More broadly, yes emotions are meant to be shared. As someone with emotions, I'm already aware of this. I'm broadcasting mine right now... underwhelm.