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I'm not sure if this is actually subtle, but in The Godfather when Michael realizes his hand does not shake.

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Agreed. That is one of my favorite scenes - not sure if its subtle or not, but I think a lot of people may not notice that the first time they watch it.

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I've watched this movie tonnes of times and never noticed it (at least haven't remembered it). Where does it happen?

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After the standoff in front of the hospital where Vito Corleone is laid up:

Enzo comes to visit Vito in the hospital and Michael notices that all his father's guards have been sent away by the corrupt cops. Michael realizes that there is an imminent assassination attempt on his father and takes Enzo with him to stand in front of the hospital with their collars up and hands in pockets as if they are armed. Afterwards, Enzo is shaking so uncontrollably that he can't even light his cigarette. Michael takes the lighter from him and lights it for him, completely calm and collected.