What do you consider the eeriest scene from the
Godfather Trilogy? You can pick a scene (or scenes) from each of the three films if you prefer, or pick a scene (or scenes) from the Trilogy as a whole.
As a guide, here's a partial definition of "eerie" from the Merriam-Webster online dictionary:
"so mysterious, strange, or unexpected as to send a chill up the spine (eg., a coyote's eerie howl; the similarities were eerie)"
I would add to that:
"giving a sense of foreboding, as if something bad or frightening is about to happen; fearfully strange; spooky; haunting"