I well remember at LGW many moons ago, about to climb the steps of a 737 when I noticed a 727 pushing back off a stand without any lights at all or obvious marshallers, along comes a catering truck and knocks out the centre engine.
Please explain this, the driver of the catering truck was sacked, his company's insurers paid the bill, it was strongly rumoured that the tug crew had had a few beers before going to collect the aircraft off the stand for either night parking or maintenance.
To me it still stinks.