Forget about the Ice Bucket Challenge or the Harlem Shake, the Mannequin Challenge is the newest and hottest trend online. It started in late October with students in high schools across America, but since then, thousands of videos have been uploaded to Twitter, Facebook and Instagram. Still wondering what it’s all about? The videos feature groups of people – including the occasional celebrity – freezing in formation while someone else films. Some videos are silent while others are set to music but many feature a specific soundtrack: Black Beatles by Rae Sremmurd and Gucci Mane.