Yes, but unless they are hit with an electrical charge they won't go off. When I was in High School, I had a car that had a driver's side air bag. As they were just starting to be used people were nervous about them, and I would routinly punch the steering wheel where the air bag was demonstarting that they won't go off if you bump it. never had a problem. I would not do it today, as I look back, that was just being destructive and possibly damaging the car, but I was young, dumb and full of ^@$.

I guess you had better watch your head getting out of the car since you could hit your head on the piller and cause the airbag to deploy, if you are using your scare logic.