The line comes from Beetlejuice, the 1988 Tim Burton film in which Michael Keaton plays the chaotic, striped-suited ghost of the title. 'It's showtime' became one of the character's signature catchphrases, capturing his theatrical love of causing trouble. Decades later, the short clip circulates widely in memes, reaction videos and edits, where it works as instant shorthand for a dramatic entrance or a moment about to turn wild. Its brevity and recognisable delivery keep it useful long after the film's release.