What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?

Medical uses - aiding in creating organ replacement

If you could build your dream 3D printer, what would it include and what would it do? Let your imagination run wild!

Enough build size to print bottle design prototypes for review - at least 18" tall, wide range of materials including transparent and food safe, remote controlled by iPads/iPhone/laptops with live video feed. Easily dissolved support structures, compatible with most file types.