The fun starts when the main gear pins are left in, but the steering pin removed. I've only seen a couple of instances of this over the years, mega embarrasment all round and loads of disruption due to a/c having to burn off or dump fuel/do an averweight landing (should that be overmass landing, now?), delays to other a/c & pax to provide to extra runway slots etc etc. Cost? Tens of thousands of pounds! Enjoyment to those not directly involved? Priceless!
TheOddOne