These already exists and are called wild demos:

From http://tomaes.32x.de/text/faq.php:

  A wild demo can be pretty much everything. Some possibilities:
  
   - It's any kind of film, usually available as divx/avi file
     (music videos, shorts, comedies, trash, prerendered animations...)
  
   - It's a demo that requires very rare/strange hardware to run
     (c64 with SCPUs, for example)
  
   - It's a demo that simply does not fit in any other competition (and the
     applying rules) of a given demoparty.
  
   - Sometimes, live performances count as 'wild' demos too. ;)
  
  However, in most cases, it IS a short movie (clip), either tradionally filmed
  or CG/animated.