The phrase comes from Ace Ventura: Pet Detective, released in 1994, where Jim Carrey plays the eccentric private detective Ace Ventura and uses 'Alrighty then' as his signature upbeat sign-off. The line became closely linked to Carrey's energetic performance and was quoted long after the film's release. As short-form video and soundboards grew, the clip was lifted as a standalone reaction sound for agreement, transitions and comedic setups. Its familiarity, brevity and instantly recognisable delivery keep it in regular use in memes, edits and streams today.