I remember seeing it, on Vimeo (I think), but now can't find it again.

It is first-person character perspective. Character gets on subway train, there are some other passengers loitering at end of carriage. Character finds an envelope as he is about to sit down, addressed to him! He opens it & finds a photograph of the exact same carriage scene, with same passengers standing around etc. When he lowers the photograph, the "passengers" have turned into demons and are right up at his face. The end.

It was kinda creepy & unexpected & I wanted to find it again but can't find it anywhere...?