Well... if you dun wanna bang your car to the wall or tree to
test the airbag, you can try hitting damn hard on the steering
wheels or dash board.
I believe nowadays the airbag systems are going by electrical
current to activate it, try to make it haywire, like sudden surge
of current in the car electrical system. Who knows, it may activate
the airbags 
Go over hump at high speed, not just your suspension lifespan
shortern, not only your under carriage gets scratched, you can also
get your brake lights plastic cover to drop.
I just replaced mine. The plastic red cover that covers the light
bulb inside the brake light assembly. It came loose and due to too
near to the light bulb, it melts a bit. The shop which I went to
change the brake light assembly was even surprise, how did a
original red cover drop out inside the assembly. $170 fly away ...
hai~~
next time go over humps must be gentle.....if you like to go over
humps so much, might as well get a SUV or jeep and go to terrain
driving, that one even more shiok. I get my share of it during my
NS time, driving land rover and 5 ton in the training area. Nothing
beats off-road driving. Full of obsticles and challanges. The cons
of it is that got to wash the vehicle when RTU... sianzz...
especially after raining days full of mud.
