lol,
Funny but we've made airbags go off before. They don't explode from the bottom. You'd hear a CRACK then POW and Hiss and the gas escapes back out. That guy would be going to teh hospital.
If you look under your hood,bonnet what ever you call it in your part of the world, you'll see the White boxes with "SRS". Unscrew that and hit it with a hammer.