It’s not uncommon – at least since the 1960s – for one character in a movie to express his or her displeasure with another by “flipping the bird” – i.e. “giving them The Finger”. It’s shown overtly often enough. But I’ve noticed that there are cases where someone pointedly uses the middle finger instead of the index finger one would expect them to use, and I suspect that in many, if not all, of these cases it’s a very deliberate act to overtly r covertly express anger, displeasure, or annoyance. The audience may consciously notice this, or, more likely, they may be aware that the gesture was somehow more hostile than they’d expect, but not be aware of why.
The first case where I suspected this to be the case was in Fred Zinneman’s adaptation of Frederick Forsyth’s Day of the Jackal. The scene is near the beginning, where Colonel Marc Rodin (Eric Porter) learns of the execution of Bastien Thierry by a radio broadcast, and angrily turns the radio off by pushing the button. But he pushed the button with the middle finger of his right hand, which is unusual. Rodin is clearly quietly angry, and I suspect Porter came up with this way to emphasize his state of mind.
Another case that I’m not sure of is in the James Bond movie Diamonds are Forever. Bond has been uncharacteristically ambushed and klonked on the head with a funeral vase and, while unconscious, put into a coffin bound for a crematorium. Bruce Glover, as Mr. Wint (half of the demonstrably and blatantly gay executioner team of Kidd and Wint), is the one to press the button sending the coffin on its trip (after first floridly moving his fingers about to – I guess - demonstrate that he’s really gay). And I think he uses his middle finger, although I’m not sure.
The last case might simply be happenstance, or a case of me reading too much into a gesture in an early sound film. But in the 1934 movie Babes in Toyland (AKA March of the Wooden Soldiers), starring Laurel and Hardy, Oliver Hardy’s character loses part of his moustache. Stan Laurel’s character innocently tries to retrieve it by wetting his finger and using that to pick up the hairs from the ground. Only he uses his middle finger for this, rather than his index finger. Maybe it wasn’t quite as innocent as it appears.
Any other cases? I’m not looking for overt Flipping of the Bird, or cases of Harvey Lembeck as Eric von Zipper in the 1960s “Beach Movies” (where’s he’s said to “give himself the finger”), but of understated cases where it’s ambiguous as to whether it was intentional or not, and it might thus add to the atmosphere of a scene.