One creepy toy that I had as a kid was the “Gre-Gory Bat”. He was a reddish brown colored bat with a clear chest you would press the button on his back, you would see his chest fill up with fake blood. He had a fifteen inch wing span and the deal was when you stuck you finger into his mouth and squeeze him it looked as though he was sucking your blood. He had his feet closed so you could loop rope through them or other random item so he could hang upside down.
He really was not that impressive but seeing his chest fill up was rather neat at the time. I think eventually I broke his chest plate to see the inner workings of him. i seem to have done this when I was really bored with certain toys.