That will ALWAYS freak me out.
That's the moment that's stuck with me the most from that movie. It freaked me out, too the first time I saw it when I was 11 or 12. After that I kept watching it whenever it would show up on tv, just to see that brief scene. I'll have to watch it again some time. What really wowed me in later years was that in the pre CGI days, I wasn't sure how they did it, but it really was a dog wearing a human mask. Of all the dogs I know, I can't imagine any of them not immediately trying to paw that thing off of them.