Underboss
Joined: Mar 2006
Posts: 1,474 No. Virginia
Maybe this has been discussed before, someone mentioned it on a Reddit board: when Fredo is ranting at Michael in the boathouse, Fredo's right hand forms into a little gun and makes an execution movement. It's at about 2:20 here:
Quick cut to Pacino for one of Michael's passive reactions.
I'm getting a playback error on the video, but here's the link:
