Yeah, I did. We tried that process a while ago. We only had one fella who had done any kind of molding before, and he's gone. Alas, all the molds busted before we could cast from them (might explain why he took off?).

One thing I'm thinking about would be to score pieces out of the skull, just random shardlike triangles, and then layer some latex over the put-back-in-place pieces, so as to form a "hinge" of something that will look suspiciously like scalp flesh. A little bit of hair and some blood smeared and it might look good enough. He can reach his hand in, we can lay the hinged flaps against his wrist and then just as the camera comes to his hand, he can be pulling a fistful of brains out through the busted skull, chunks of it giving way to his mighty thews.

With some nice crackly gooshy sound effects, this might realy revulse folks the way I want it to.