The line comes from The Princess Bride, the 1987 fantasy adventure film based on William Goldman's novel, where Miracle Max revives the mostly dead Westley and helps plan the rescue of Buttercup from Prince Humperdinck's castle. As the heroes depart, Max delivers this parting line with knowing humour, and it has since become one of the film's most quoted farewells. Online, it spread through quote compilations, reaction videos and soundboards, where it is still reused as a light-hearted goodbye before someone takes on an unlikely challenge.