Project plan: a room that protects itself

My idea would be to use a room, and create a self-protecting system to it. When visitors enter the room, they’d launch an airbag-like-balloon that would fill up, pushing the people away. This could be done maybe by using an industrial fan and a plastic bag or sails..

If it’s not possible to use or to make a whole room, a smaller scale version of the smae idea would be to make a floor spot that when stepped on, would trigger an alarm, done with light and sound. Maybe using a simple pressure sensor..

I wan’t to play with people’s instincts and learned behavior. How do people behave and what is interaction anyway..