Watch how Guillermo del Toro and his team of insane special effects geniuses made a decaying corpse fly around and scare the shit out of absolutely everyone, in this exclusive behind-the-scenes clip from Mama.

Yes, trapped inside that mask is contortionist and actor Javier Botet. Everything you saw in the horror movie Mama was either prosthetics, or Botet's actual body. The only thing added to this terrifying lady were decaying breast lumps and the wispy hell hair. Apparently the filmmakers wanted her to look like a Modigliani portrait. Mission accomplished.

This video is part of the Mama DVD and Blu-Ray release, which is in stores now. Now please excuse us while we turn every light in our house on ultra bright.