Like horror? Try this little guy on for size:
It’s a real creature, the 25mm promachoteuthis sulcus, a squid found a mile below the surface of the Atlantic. (Here’s its Tree of Life entry.)
But in a different size, or sticking out of someone’s stomach, or in place of an otherwise normal human’s head, this thing would be great for a horror game.
It’s those damned teeth — they’re so human-like, and that kind of incongruous juxtaposition can be very creepy. (Via Boing Boing.)