The “I got this rat” scene in The Departed (2006), where Jack Nicholson’s character Frank Costello taunts Leonardo DiCaprio’s Billy Costigan, was largely improvised by Nicholson. His unpredictable intensity made the moment iconic. DiCaprio later called filming the scene a career highlight, praising Nicholson’s ability to elevate the tension and authenticity of Martin Scorsese’s crime masterpiece. | Historyinmemes