what makes the song threatened so scary?

it's not scaring me

Um it's not scary.

I'll show you what scary is, watch Paranormal Activity 2. :)

thriller sometimes when iam watching the video clip,it's quite scary and ghosts the movie,too but it's also funny:)

I personally think it's because of the overall theme and that Michael is portraying himself as some kind of monstrous figure akin to the classic boogie-man.