I've never cried watching a Godfather scene, but I always feel a great sense of sadness watching the scene where Tom tells Vito about Sonny's death. Sonny is one of the most likeable people in the trilogy (after Vito, he's my favorite character) and one does get the feeling that his death was a terrible tragedy. The acting by both Brando and Duvall here is masterful--one really feels that their crying and the anguish on their faces is sincere. I'm a Civil War buff, and I've often thought that in terms of the emotional blow of it, the effect of Sonny's death on the Corleones was similar to that of Stonewall Jackson's on the Confederates. Both men were highly charismatic (although in different ways) figures whose deaths left a great void.