Rope
I think I just love movies under 100 minutes that takes place in a single room. This is so incredible. The main 2 actors are so charismatic and James Stewarts character being a detective and finding all the clues and deducing the crime is so fun. And there are conversations which really makes you think about the idea of murder. This might be my favourite use of blocking in a movie and it's constantly and I just love when movies have good blocking.