User blog comment:Eminemgoeswild/ horror villain characters cast prediction/@comment-28938497-20150913153802/@comment-24322797-20150913154050

It's because Mark played Slender Man in a video called The Slender Song or something like that. He did a killer voice for him and he's really just a good symbolic actor for him, since he's big on horror let's plays and Slender really boosted his fame