A documentary that uses YouTube videos to critically analyze the construction of the Slender Man myth on the internet, exploring how it emerged on forums and websites and ended up triggering bizarre situations among young people, some culminating in tragedies. The approach is interesting, especially as it uses users' own videos to tell the story. However, the lack of a more careful organization of these materials makes the development a little confusing. Even so, it is interesting to analyze and reflect on the impact of these myths and the consequences of their dissemination.