demo mode

demo mode n.  1. [Sun] The state of being {heads down}
   in order to finish code in time for a {demo}, usually due
   yesterday.  2. A mode in which video games sit by themselves
   running through a portion of the game, also known as `attract
   mode'.  Some serious {app}s have a demo mode they use as a
   screen saver, or may go through a demo mode on startup (for
   example, the Microsoft Windows opening screen -- which lets you
   impress your neighbors without actually having to put up with
   {Microsloth Windows}).