I had an idea for a restaurant design. Particularly useful in high crime areas. If the place were being robbed, one of the staff could hit a 'hostage' button and all of the windows in the place would turn into doors and slide open providing a quick escape. The number of exits in the place would go from two to 20 and the patrons could scatter out the window-doors leaving the criminal with few hostages. Criminals hold hostages by controlling the few exits a place has. It's just a bottleneck. Opening the whole restaurant up would negate this form of control. Crime would be reduced by a simple, extra architectural feature.
I thought it was a good idea.