The 'Headlight Fluid' meme refers to a legendary 'snipe hunt' or prank used to trick those unfamiliar with automotive maintenance into searching for a non-existent product. While the concept of sending a novice to find 'elbow grease' or 'blinker oil' is ancient, the term gained massive internet fame through the machinima series Red vs. Blue, where the character Caboose is famously sent on a mission to find headlight fluid. The meme serves as a rite of passage in car culture and trade jobs, poking fun at the gullibility of newcomers. Today, it remains a staple of mechanic humor, often used in fake product photos or to mock someone's total lack of mechanical knowledge.