Alrighty Then comes from Ace Ventura: Pet Detective, the 1994 comedy that made Jim Carrey a leading star. Carrey's eccentric detective used the phrase as a cheerful sign off and agreement throughout the film, and its sing song delivery helped it enter everyday speech. Clips circulated through television repeats, quote compilations and later meme edits and soundboards, where the short line works without visual context. It remains popular because the wording is clear, the performance is distinctive and the tone fits both sincere and sarcastic agreement online today.