Enemy is a riveting film, but the ending is one of those conclusions that makes you squint a little and ask, "Wait, did I really just see what I think I saw?" This psychological thriller, directed by Denis Villeneuve and starring Jake Gyllenhaal, is based on José Saramago's book The Double. It follows Adam Bell and Anthony Claire (both Gyllenhaal), two men who are completely different in terms of personality, yet look so alike they could easily be twins.

Towards the end of the film, Anthony is thought to be killed in a car crash, but Adam lives on — he has convinced Anthony's wife, Helen, that he is actually Anthony. Adam calls to Helen, who is in the bedroom, to tell her that he plans to go out that night. When she doesn't respond, he enters the room, only to find out that Helen is no longer there. Instead, she has been transformed into a giant, black tarantula with no warning. He doesn't freak out — he simply sighs, and Helen's metamorphosis is never explained.