Gollum all the way! That's what I thought as well when I first saw the Inferi.
I actually expected them to look like the dead bodies in LOTR. You know, in book 2 I think, where Froddo is dragged down by bodies inside the lake, and the Gollum pulls him out? They were eerie, dead bodies who had not melt to bones. They were awesome! But I guess the Inferi had to look more frightening than perfect dead bodies.
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Though when that hand shot out of the water I jumped....
I jumped when the hand grabbed Harry as well! I was expecting it, just like everyone else, but we all screamed nontheless. It was so funny!
The scene in the cave was brilliant. The masses of the Inferi under the lake really freaked me out. It was disgusting. That's definitely one thing I'm not disappointed of!