I saw a Varig 707 freighter reverse off-stand at the LHR Cargo Terminal many years ago, the Captain had decided his departure slot couldn't wait evermore for the long-overdue tug. This was during summer and the cargo guys definitely weren't happy about all the dust, grit, bits of wood and empty boxes etc, all being blasted through the airside warehouse roller-doors, which were unfortunately wide open!
Expected to incur the BAA's major displeasure, but never heard any more about it. A sight to behold!