#9: Randy Quaid as Cousin Eddie
Cousin Eddie bursts into the movie as the hilariously chaotic wildcard of the Griswold family. His oddball habits, questionable life choices, and total lack of self-awareness create some of the film’s funniest and most quoted moments. Eddie represents the kind of relative everyone recognizes—well-meaning, unpredictable, and impossible to forget.
At the time filming took place, Randy Quaid was already known for his strong comedic and dramatic performances. He’d earned acclaim in movies like The Last Detail and had built a reputation as a character actor who could deliver big laughs with complete sincerity. His portrayal of Eddie became one of his most iconic roles.