We've all had neighbors that seem a little off, and whom we side-eye in the hallway. But most of them aren't murderous, or at least we don't think they are, let alone catch them in the act.
In Alfred Hitchcock's 1954 classic Rear Window—maybe the ultimate lesson in "good fences making good neighbors"—temporarily wheelchair-bound photographer L.B. Jeffries (played by Jimmy Stewart) passes the time looking out from, yes, a rear window onto his apartment complex's shared terrace, and eventually, into his neighbors' homes.
It's all standard-issue urban voyeurism until he starts to suspect that one of his neighbors, a salesman, has murdered his invalid wife. The neighbor, played by Raymond Burr, doesn't exactly look not suspicious, and Stewart (along with girlfriend Lisa Fremont, played by Grace Kelly), watch him through binoculars as he rifles through his missing wife's purse, makes a series of mysterious trips with a suitcase in the middle of the night, and sits in his living smoking cigarettes alone in the dark: