Alvin is the lead character of Alvin and the Chipmunks, a franchise built around three singing chipmunks whose voices were created by recording vocals at a slower speed and playing them back faster. That sped-up effect became Alvin's trademark, giving him a cheeky, high-energy personality that stood out in cartoons, films and novelty songs. Online, short clips of his voice are now reused as reaction sounds because the voice is instantly recognisable, even without context, and it immediately signals mischief, excitement or playful chaos.