It's virtual reality, but you should see these people squirm when their heads get chopped off.
They're wearing the Oculus Rift VR headset and they're experiencing Disunion - The Guillotine Simulator, created in two days by Erkki Trummal, Andre Berlemont and Morten Brunbjerg during the Exile Game Jam.
Victims pop the glasses on, bend over into the guillotine (in reality, a chair or a surface), and look up as the angled blade drops down to remove their rebellious heads from their bodies.
There's a Windows build of the game/experience available from Unicorn 7.
The video (via Mashable) is below.