Shenmue is a Sega adventure game first released for the Dreamcast in 1999, known for its detailed open world and spoken dialogue with the people Ryo meets. The 'You know Charlie' line comes from that in-game questioning style, where a short, direct question can set up a whole search. As a standalone soundboard clip, it spread among Shenmue fans and gaming editors who recognised its dry, investigative tone. It remains useful because the question needs no context to sound like the start of a case.