The greeting comes from Half-Life, the first person shooter released by Valve in 1998, where the scientists of the Black Mesa Research Facility act as nervous non player characters who speak to Gordon Freeman in short scripted lines. Their polite, procedural dialogue became a defining part of the game's atmosphere, and clips of their voices later spread through forums, machinima, Garry's Mod videos and meme edits. The line remains popular because it captures the charm of early game voice acting, formal, helpful and completely out of step with the disaster unfolding around it.