Dumb and Dumber is a 1994 American comedy film starring Jim Carrey and Jeff Daniels. The movie follows the story of two good-natured but dim-witted friends, Lloyd Christmas (Carrey) and Harry Dunne (Daniels), who set out on a cross-country road trip to return a briefcase full of money to its rightful owner. The term 'DUMB and Dumber' has become a popular phrase used to describe someone who is not very intelligent.