Party Button (for instant camera)

  A friend of mine is a photographer. A number of years ago now he took some photos in a bar during New Year's eve celebrations. On some of these he used a double-exposure technique, the results of which are a clearly focused "static" subject and "moving" surround, in particular lights, cigarette ends etc.
  I think this is an idea which could be developed and made available to those of us who aren't dedicated photographers but like to take a camera along to a party or club.
  The results are really good I can promise you of that.
  If camera makers were to enable this feature more easily I'm sure many people would be very grateful!