The line comes from the 2004 comedy Anchorman: The Legend of Ron Burgundy, spoken by Brian Fantana, played by Paul Rudd, during a scene about his Sex Panther cologne. The joke was quoted widely after the film's release, first on forums and quote pages, then as a short reaction clip on video and soundboard pages. Its faulty percentage became shorthand for overconfidence in something clearly unreliable, which keeps it popular for memes about luck, bad statistics, and products or plans that only sometimes deliver.