Rick Astley released 'Never Gonna Give You Up' in 1987, and the cheerful pop single became a worldwide hit. Two decades later, internet users began sharing it through misleading links, a joke that became known as rickrolling and spread quickly across forums, video sites and social media. The trick worked because the song was so familiar, and the surprise became part of its appeal. It has since appeared in April Fools jokes, livestreams and reaction videos, and it remains a simple, instantly recognisable way to prank an audience.