Great subtle moments in movies

[Lanzalot]

From Dr. Zhivago. Omar Shariff (Dr. Zh) is coming back from the front where he served with a medical unit. The revolution has happened and he's coming back to a vastly different Moscow, ran by the Reds. He gets to the house to find it's been turned into an apartment building of sorts, ran by the Communists. He gets a stern lecture about all this (he and his family were wealthy before 1917) from the tenant super, a Commie. He and his wife go to their room, he goes to greet young son, bends down to hug/kiss him and his kid slaps him! The scene says so much by doing so little. Just Perfect.