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Robert De Niro's 'You talkin' to me?' monologue was improvised, reflecting the isolation and paranoia of his character and becoming one of the film's most famous scenes.

Dustin Hoffman's 'I'm walkin' here!' exclamation was a real reaction to a taxi driver nearly running into him during a take, underpinning the film's gritty, realistic vibe.

Woody Allen's sneeze into the cocaine, which was unscripted, highlighted the absurdity of his character's social faux pas, adding humor to a scene about the cultural trends of the time.

Roy Scheider's iconic line 'You're gonna need a bigger boat,' which was an improvised reaction to seeing the shark, perfecting the tension and realism of the scene.

The scene where Vito Corleone (Marlon Brando) gently plays with a cat was improvised, humanizing the Don and adding to the film's iconic status.

Bill Murray's 'Cinderella story' monologue was completely improvised, adding to his character's quirky charm and solidifying the film's cult status amongst comedy lovers.

Robin Williams' character shares an improvised story about his wife's quirky sleeping habits, adding depth to his character and showcasing Williams' talent for improvisation.

The hospital explosion scene where The Joker (played by Heath Ledger) improvises by fiddling with the detonator, showcasing the character's unpredictability and chaos when the explosions paused momentarily.

Martin Sheen's hotel room breakdown, where he punches a mirror and breaks down in tears was unplanned and captured the actor's real emotions at the time, deepening the intensity of the film's exploration of mental collapse during the Vietnam War.