My challenger has a couple of scratches under the front spoiler from when I pulled too close to a curb once. Nothing visible and I was thinking of eventually replacing it with a SRT spoiler, so no worries. It can happen.
I did have Wal-Mart damage a front plate on my Ford truck several years ago. I had taken it there for a tire patch and the front plate was fine up on the lift (I had actually looked at it while it was up there because I was debating changing the plate frame).
Anyway, got my vehicle back and drove it back to work. As I got out, I notice the front plate and frame had been folded in half, bracket bent horribly and everything. I was sure they had to have dropped the truck on something when bringing it off the rack. Drove it back, Wal-Mart denied everything (go figure). I'd had a prior experience with the same truck and Wal-Mart not tightening the lugnuts up enough...damn near lost a whole wheel on the interstate - lost 4 out of 5 lugnuts. Caused plenty of damage to the rim and studs as well. They denied that one, too :icon_evil:
My father-in-law also took his Explorer there once for an oil change, waited a couple of hours before they told him it was done. He popped the hood to check and not one fingerprint under the hood with the oil as black as can be...they never actually changed it.
Moral of the stories is: You get what you pay for. Never let some twinkie working for minimum wage at a Wal-Mart lube shop work on your vehicle.