Something went wrong.
A magician was performing the sawing in half illusion. He was using his own wife as his assistant. He placed her in a box to saw her in half, but instead of sawing with the traditional hand saw, he chose to use a more dangerous chainsaw.
I'm not sure what went wrong, but there was a terrible accident.
Do not watch this video if you're squeamish.
Some have said the video's a fake, but it's not listed as a fake at snopes, the site that exposes hoaxes. And at a popular online magic site, magicians who know the secret to illusions like this also did not reach a consensus about whether it's real or fake.
If you're able to watch it... what happened?
Magician Chainsaw Accident
Snopes, the urban legend reference page>>