Futuristic Fly Catcher

Picture this - you see a fly in your house, you take a can, aim it and spray. The can releases hundreds of micro-flybots that coordinatedly zero-in on the real fly and finish it off. Poor fly. Then, the bots just fall harmlessly to the carpet after reducing the each bit of fly that they contain to simple elements/compounds that can't be food for germs. You'll want to vacuum sometime soon.