This story happened, don't think it's false.
Two twins were chatting on Halloween; like a girl who was died 13 years ago.
They received an anonimous chat from "Dvil".
"Do you like Halloween, isn't that? Well, well. You should know I am dead. I am a scary ghost. DVIL"
The bravest twin wrote to Dvil:
"And what are you going to do? Kill us?"
"Probably yes, why not?"
The bravest twin laughed.
"Yes, sure :-D"
"Yes", Dvil wrote, ", I'm seriously. Hey, I am behind you. Don't look back to you..."
The bravest had a mistake. She looked back, Dvil was there and... You could imagine.
So, don't chat in Halloween. It is dangerous.