Un Chien Andalou is a classic European avant-garde surrealist film from the cooperation of director Luis Buñuel and Salvador Dali. The film changed the way people made movies. Most famous is the scene of a woman’s eye being cut with a knife.
This movie contains 11 potentially triggering events.
Dead and rotting donkeys are shown. There is a close-up of a dead calf's eyeball being sliced with a razor (you're supposed to think it's a human eye).
A man stares at his hand, and in close-up we see ants crawling in and out of a hole in the palm of his hand. The hand is obviously fake by modern special effects standards, but it's a potentially disturbing image anyway. The image reappears later - this time a real hand with ants crawling on it. There is also a close-up of a moth on a wall.
There's the famous eyeball-slicing scene. In another scene a woman is shocked to discover that her armpit hair has disappeared (we don't see it being shaved).
Ants are shown crawling in and out of a hole in a human hand, and in another scene, a severed hand lies in the street while a young woman pokes at it with a cane.
A woman's eye is cut with a razor; the woman appears willing to let this happen so I'm not sure if it counts as torture. See the description under "eye mutilation"
There's an infamous scene where an eyeball is sliced with a razor, and clear liquid runs out. This shot occurs less than 2 minutes into the film (in the version I watched on YouTube, between 1:39 and 1:46). It's gory, but brief. It was filmed with a dead calf's eye, although it appears right after a shot of a woman's eye, so you are supposed to think it is a human eye.