The line comes from Valve's Half-Life, released in 1998, where non player scientists at Black Mesa react fearfully to the player and to invading forces. The scientists became iconic for their anxious voice lines, delivered in a distinctive nervous tone that players quoted for years. Clips of their dialogue spread through forums, machinima and later meme edits and soundboards, where short pleas like this one survived as a shorthand for a bystander caught in a firefight who wants no part of the action.