The Silhouette Challenge became a massive viral trend on TikTok in early 2021, set to a mashup of Paul Anka’s 'Put Your Head on My Shoulder' and Doja Cat’s 'Streets.' The format typically features a creator standing in a doorway under normal lighting before transitioning into a seductive red-filtered silhouette. While it started as a showcase of body positivity and aesthetic lighting, it quickly evolved into a meme format where people subverted expectations with humorous reveals or unexpected characters appearing in the silhouette. It remains a staple of internet culture for its mix of noir aesthetic and comedic potential.