Half-Life, released by Valve in 1998, placed players inside the Black Mesa research facility, where unarmed scientists reacted to alien creatures and military soldiers with panicked voice lines. Their short fear sounds were later ripped from the game files and shared on soundboards, where clips like this one became handy shorthand for panic in fan videos and streams. Because the scientists are so recognisable to players of the original game, even a fraction of a second of their nervous voice is enough to signal danger, embarrassment or a plan falling apart.