Remember one Captain that taxied away before the ground crew were able to move the GPU. He didn't get very far before there was a grinding jolt as metal struck metal.
Also remember the case of an overzealous Captain that set off at a hot trot before the poor ground engineer could uncouple his headset from the aircraft. He sprinted the fastest 100 meters ever, rather than be sucked in by the CFM 56-3 B2 that was right up his @ss! Captain couldn't understand the expletives coming through his headset!
Apart from that, sadly had a number of instances of stairs, luggage conveyors and the like punching holes in an otherwise very serviceable aircraft. Rarely does the culprit's company ever get to pay the cost. You have to proove negligence first. The airline normally ends up springing for it, due excess on insurance policy.
I caught every culprit, and not one of them was in the slightest concerned about what he had done! Spanish and Greek airports were the worst in my experience.