What you are looking at here is an example of why you should NOT fire a gun randomly into the air. 

These are actual photos of a bullet that lodged itself into the rear bumper cover of a brand new Ford Fusion.  The bullet was originally embeded flush with the surface of the bumper cover.   The repair was made and the bumper was returned back to it's original appearance, but let this be proof that dicharging a firearm into the air CAN be potenially deadly.
"The Bullet"