Sooooooo many people guess that. It was actually this right here:
http://en.wikipedia.org/wiki/Malignant_fibrous_histiocytoma
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"I'll never forget the moment during the lovely Alyssa Allure's scene in 'American Bukkake' where the fellow got out of his wheel chair to ejaculate on her face. It was grotesque but had a certain frisson." -Sock