I am of course referring to the "Sonny-flashback" at the end of II. We see Mike slumped dejectedly in his chair after Fredo's death, a very heart wrenching end to the movie. Then the scene fades to Sonny saying...Hey, everybody, come on pay attention. The first time I watched this my heart almost stopped beating. For about .0000001 seconds I thought that he (Sonny) was still alive.