If you manage to detonate the airbag I don't think beating up the car will be your first thought, lol...

Disconnect the battery cables and let it sit for a bit. I think if you press on the brake pedal it will bleed off any residual power in the system. I think 10 min. does it for the airbag system but double check just in case. And IIRC the pass. airbag is bolted to the dash frame, so it would have to come out as well, or at least be disconnected from the electrical harness.