The phrase comes from Ace Ventura: Pet Detective, released in 1994 and starring Jim Carrey as the eccentric animal detective Ace Ventura. Alrighty then became one of his most quoted catchphrases from the film, repeated throughout his investigations as a brisk sign-off before action. Clips of the line spread widely online as a reaction sound, because the delivery captures agreement, confidence, and comic exaggeration in just over two seconds, making it easy to reuse across edits and conversations.