10) Taxi Driver (1976)

Robert De Niro improvised the chilling "You talkin' to me? " line De Niro gave over to his character's lonely and unstable nature, thereby committing one of the most synonymous phrases that has ever characterized both personal turmoil and city-state desolation. Director Martin Scorsese credited De Niro's improvisation for what would ultimately be one of the more definitional moments of the movie. The scene remains a benchmark for actors portraying highly troubled characters.
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Edited by Abhimanyu Sharma