Air bags will propel anything in front of you now at different speeds. It depends on if your car is equipped with the stage bags now. It is a SRS system which means it works with a seat belt. I have seen a bunch of wrecks where the person slides between the bags and gets stopped by the windshield.
The ones where they put their feet up on the dash. Some of the older air bags use the windshield as a deflection point for the airbag. I've seen what happens when people do that too.
If you have your hand on the horn and the bag goes off you may be picking your nose like jacques cousteau going to the deepest depths.