Enemy (2013)

Blimey! I won't even attempt to review this as it's so complicated. I'm going to point you at a spoiler-riddled YouTube video that, even though many interpret the film in many ways, I was sold on this chappie's analysis, explanation and outcome.

The bones of it are that we follow Jake Gyllenhaal, a teacher, as he becomes aware of an actor out there who looks exactly like him and goes off to investigate, eventually meeting him and trying to work things through about how this can be.

They're as alike as identical twins down to the finest detail and yet, his mother, played by Isabella Rossellini, confirms in that he was certainly her only child. Sarah Gadon and Mélanie Laurent play good parts as the two leading ladies, one his girlfriend, the other, the actor's wife.

The film opens with an incomprehensible scene in some sort of sex club and ends with a complete jaw-dropper. I'll say no more! If you're smarter than me you can work it out (or interpret) for yourself - but the 25-minute detailed explainer in the above-linked review is recommended if you can't get there! It's out there on a few streaming services now. It's based on the book The Double by José Saramago if you fancy an even deeper dive!