Anyone talking about LTS. There's a billion versions. and theyre all fake. If you search it on youtube. People tend to edit the sound to make it more uneasy, as well as pictures. If there was any sort of death/injury from it gamefreak would have announced something, and nothing was said of this until 2010.
Personally i found it slightly creepy thats for sure. But you grow to like it eventually. I whistle it all the time.