12 Angry Men - 12 men from a jury deliberate a murder trial. The whole film takes place in one room. I love this because we as the audience never leave the room and have to make our mind up about the case based purely on what these men discuss in the room. We don't see the accused or any of the trial so there is litterally no predisposition. One of the best films I've ever seen.
Room - A really harrowing tale of a woman and child kept in a room against their will for several years. For the child the room is all they know too as they are born in it. So its a really fascinating look at a woman who has lived in and knows of the world and a child who only knows of the room and how the mother has to deal with that. Both leads are utterly fantastic and one of only a few films to make me cry, not just tear up (loads of films have done that), but really make me a blubbering mess.
Lion - Another film that absolutely wrecked me and made me a crying mess more than once. The real life story of an Indian man who uses Google Maps to find his birth mother and village after becoming lost and separated from his brother when he was only 5 years old.
Rear Window - One of my favourite Hitchcock films with one of my favourite actors of all time, Jimmy Stewart. A man laid up in his apartment with a broken leg begins a fascination with watching his neighbours from his apartment window, only to discover that one of them may be harboring a terrible and deadly secret.