Hello, Slenderman
There is nothing scarier to people than seeing characters they are frightened of from scary movies or books. And while it would be kind of strange to torment people randomly with these characters, Halloween gives people the perfect opportunity to use these characters to frighten others.
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So can you imagine walking outside and just seeing Slenderman standing in the neighbor’s backyard? I’d rather not. His character is depicted as an unnaturally tall humanoid, which these people have managed to capture reasonably well.