Writer's Block: A riddle wrapped in a mystery inside an enigma

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We've had this before. I should link to the entry, but instead, I'll copypaste.

Scary
"You will die soon."
"Your worst fears will come true."
"The real world is a lie and your nightmares are real."
"Beware of the second shadow."
"Gloves come in pairs."
"We are coming."
"Death will knock four times."
"The ground will eat you from beneath."
"If you see, run!"
"I see you."
"Water is patient. Water always waits. Water always wins."
"Are you my mummy?"
"Ignore letters from houses that haven't had people living in them for thirty plus years." - That's because of the story I'm writing.
And probably some one line creepypastas.
( Funny and more under The Cut of Rassilon! )