Let's kick it off with everyone's favorite artificially intelligent toy, the Furby:

What we learn from the Furby is that creepiness is a function of cuteness, cuddliness, and intelligent thought, inversely proportional to the amount of soul-lessness of the possessor.
Which then bares the question: "If a soul is then factored in, why then would a creature similar to a Furby in cuteness and cuddliness be considered creepy?"

The answer to that question resides in the possibility of unexpected transformation into something altogether more hideous, grotesque, and evil.
i.e.

Now, Real-world example #1
Cuteness: check. Cuddliness: check. Soul-lessness: well, you decide...
