Half-Life was released by Valve in 1998 and set in the Black Mesa Research Facility, where non-player scientist characters react to the alien invasion with a set of now famous voice lines. The get back warning is one of several short panicked lines players heard repeatedly while exploring and fighting through the facility. As Half-Life clips, mods and memes spread online, those scientist shouts became shorthand for retro gaming panic, and this one is still reused on soundboards and in edited gameplay videos.