Never Gonna Give You Up was released by Rick Astley in 1987 and became a worldwide pop hit. Two decades later it was reborn online as the Rickroll, a bait-and-switch prank where a promising link unexpectedly led to the music video. The joke spread rapidly through forums, YouTube and social media in 2007 and 2008, turning the song into shorthand for a harmless trick. It has stayed popular because the opening is universally recognisable and the prank still catches new audiences by surprise.