The line comes from Die Hard (1988), where Bruce Willis plays New York police officer John McClane, trapped in a Los Angeles skyscraper during a terrorist takeover. McClane delivers the greeting with dry humour as the situation turns violent, and the phrase stuck because it sounds both welcoming and threatening. Decades later it spread through film quotes, reaction videos and short-form edits, where creators reuse it as a punchline for arrivals, confrontations and unexpected guests. Its short length and instantly recognisable delivery keep it useful for memes and gaming clips.