What is the greatest close-up shot of all time in your opinion?

For me, it's probably the close-up shot of Al Pacino in the diner scene in The Godfather.

The way Coppola slowly zooms in from the over shoulder shot of Sollozzo to push into Michael and how Pacino’s eyes begin to rapidly shift around as he contemplates what he's about to do is amazing.

With the train getting louder in the background raising the tension in the scene and Pacino's performance, it's the perfect close-up in my opinion.