I'm fully aware that the Sharp Act Knife Sharpener doesn't actually involve the morbidity of decapitation, but I still find it disturbing.
The oldest trick in magic of sawing a person in half has been recreated in the Sharp Act Knife Sharpener. It doesn't seem as grotesque since the original act is an illusion, but just look that figure's face. The wide-eyed expression kind of indicates that the lady would like to get out especially if you're running your blade through her several times just to sharpen it. But despite its gruesome nature, it should be entertaining for adults. It's fine for kids, too -- just don't look crazy and laugh maniacally in front of them as you use it.
The Sharp Act Knife Sharpener is available at Neatoshop.com.