Actually, there's no argument about Michael's mask. It was indeed sculpted from a mask of William Shatner from 1978. The cheeks and nose were built up a bit and it was painted white.

It wasn't turned inside out, though.
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Jason Vey
The Grey Elf
http://www.grey-elf.com/
Visit my online store at http://www.cafepress.com/bigheaddesign
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If everyone knows the supernatural is real, than any psycho with a grudge can summon up Azathoth and destroy Oklahoma.--Nyarlathotep, BtVS RPG posting forum