Said face is pretty much modelled directly off the screaming zombie cat from Video Game Video's ident, and it was plenty creepy then. And now, just like the cat in those videos, Fluttershy's face started popping up in these.
The other way around, really. The Eldritch Abomination clearly states that no one should lay eyes on it "for sight begets curiosity, curiosity begets desire, and desire begets obsession." Jappleack is willing to die just to see what this thing is.