Never Gonna Give You Up was released by Rick Astley in 1987 as his debut single, and it became a worldwide pop hit. Two decades later, internet users began disguising links to its music video as links to something else, a bait-and-switch joke that became known as rickrolling. The prank spread through forums, video sites and social media in the late 2000s, helped by its catchy chorus and the gap between the serious setup and the cheerful song. It endures because the joke is harmless, instantly recognisable and easy to reuse.