I did the same, though not quite that bad, to my black 02 GT. I raked the rear fender on a shelf on the side of my garage while backing in...lesson learned - I NEVER backed in to a single stall again...only in the middle (when cleaning, vacuuming, etc - it's a 2 car garage)
A few months earlier, same shelf, I bumped into the shelf (me, not the car) and tipped over a fire extinguisher that was on the shelf. Of course it had to bounce off of the front fender and put a nice dent into it (parked straight in this time). I was never so glad to get rid of those damn shelves...they had it in for my car.
I have a ladder hanging over my Mach now...and while it only weighs about 10 lbs or so, and I've tested the hooks holding it to the ceiling with my body weight, I still worry...LOL