They say that in space, no one can hear you scream. Which is technically true. The lack of air DOES actually preclude the transmission of sound. However, when the body realizes that it's in the vacuum of space, and implosion is imminent (and keep in mind, this all happens in less than the blink of an eye) the mind screams and the soul releases a howl that the higher beings find deafening. Therefore, the interdimensional beings of the universe respectfully request that you double-check all life support equipment for faults prior to all space walks. Thank you for your cooperation.