Very interesting,As already mentioned about the shadow people, here are two other examples
I will insist on the music being the biggest turnoff with these videos, and probably one of the reasons why people tend to look away from them, I think the music is meant to be scary, that is the association of the music with the event is meant to generate fear... and that is only going to attract certain people, and while it is paranormal in a sense.. it does not invite study.
Sorry to add the above, but it just struck me that this is one of the reasons things like this are avoided, and not studied.