Dumb and Dumber is a 1994 American buddy comedy film directed by Peter Farrelly, who cowrote the screenplay with Bobby Farrelly and Bennett Yellin. It is the first installment in the Dumb and Dumber franchise. Starring Jim Carrey and Jeff Daniels, it tells the story of Lloyd Christmas (Carrey) and Harry Dunne (Daniels), two dumb but well-meaning friends from Providence, Rhode Island, who set out on a cross-country trip to Aspen, Colorado, to return a briefcase full of money to its owner, thinking it was abandoned as a mistake though it was actually left as a ransom. Lauren Holly, Karen Duffy, Mike Starr, Charles Rocket, and Teri Garr play supporting roles.

The buddy film is a subgenre of romantic comedy, a combination of the romance, adventure and comedy film in which two people, bonded through some kind of affection or love for each other, go on an adventure, mission, or road trip. The two typically are males with contrasting personalities. The contrast is sometimes accentuated by an ethnic difference between the two. The buddy film is commonplace in Western cinema; unlike some other film genres, it endured through the 20th century with different pairings and different themes.