M. R. James

The worst part isn't the teeth—it's the intelligence in the eyes.

He flew out of his chair with deadly, inconceivable terror clutching at his heart. The shape, whose left hand rested on the table, was rising to a standing posture behind his seat, its right hand crooked above his scalp. There was black and tattered drapery about it; the coarse hair covered it as in the drawing. The lower jaw was thin—what can I call it?—shallow, like a beast’s; teeth showed behind the black lips; there was no nose; the eyes, of a fiery yellow, against which the pupils showed black and intense, and the exulting hate and thirst to destroy life which shone there, were the most horrifying features in the whole vision. There was intelligence of a kind in them—intelligence beyond that of a beast, below that of a man.