One thing that I teach all my students is the handshake. I think is fundamental for a game like chess. If you don’t give your hand to your opponent is like you don’t respect him. I see some players that when they lose, they don’t give their hand. It is like they believe that they lost unfairly. And this like to offend their opponent. What you would do if your opponent didn’t not give you his hand?
This photo is one more blurry one that I liked it because shows the movement in their hands