I was the Ground Movement controller at a regional airport some years back, when an Airbus 320 taxying to stand, turned inbound to the stand centreline then stopped about 30 metres short of where he should have. The pilot explained that they were taxying on one engine and the main wheels had settled in a very slight dip (a grated drainage channel) that ran across the back of the stands. Normally such a slight dip was barely noticeable, but they considered that they'd have had to use so much power from the one engine to move forwards again, that it would have created a jet blast hazard on the apron. Remaining engine shut down and aircraft eventually towed onto stand by a tug.