I'm sorry, but I don't want to see a dummy do human things when he doesn't have his ventriloquist's hand in his back. That's an episode of 'Goosebumps' (or was it 'Are You Afraid Of The Dark?'?). Weird.
Also an Anthony Hopkins movie, MAGIC (1978). Most ventriloquists' dummies were just plain scary. I preferred Senor Wences and his "Johnny," which was just his hand dressed up as a little boy.
Well dolls in general are scary. You know you're thinking 'did that just blink?' 'This one that's talking, are there batteries in it?', they creep a lot of people out and sometimes with good reason I think.