James Stewart starring in Alfred Hitchcock's "Rear Window" movie (1954). Scary near the end.

To partially quote others "... in 1997 was added to the United States National Film Registry in the Library of Congress as being "culturally, historically, or aesthetically significant" and many other awards and considerations for awards.

Why scary? With Alfred in a one-off movie even the good guys and gals you've "grown attached to" can die a horrible death.