"Write the scariest story you can in three words!"
I was a little annoyed when I saw that get tossed around social media. Not so much because I couldn't come up with something, ("It's never sated" or "She died, repeatedly" perhaps) but rather that it's getting close to just an emotional story in two words, or one, or in an emoji or symbol.
And that'll just be boring, since people will try to come up with stuff, but there is really only one symbol that can be seen as a scary story all by itself.
That is, the infinity symbol.