Sonic.exe began as a horror creepypasta story posted online in 2011, reimagining Sonic the Hedgehog as a demonic, blood-eyed entity trapped inside a haunted game cartridge. The story inspired fan art, videos, and fan-made horror games, and its distorted laugh became one of the character's most recognisable traits. Clips of the laugh spread through YouTube horror edits, gaming memes, and short-form videos, where it signals that something familiar has turned evil. It remains popular because the contrast between a cheerful childhood hero and a menacing voice is instantly unsettling.