https://www.youtube.com/watch?v=cef35Fk7YD8&index=4&list=PLL_Dsbsw8k-2ymoDTIshBmLtuaIsAIj7n&t=0s
This tedtalk describes it verywell,how we manage to that. I would really recommend to you to watch it.
"Our emotions cause of face but our face also cause our emotion" That's called the facial feedback hypothesis.
"What is most effective conversation starter?" It's has been found when dopamine is triggered in verbal converstation, the person you're talking to will make a mental note and the happy side effect is You will become more memorable.
In the video she will discuss more interesting subjects. And very well explained.Give it a look!
Until next time! Durzo