My Dad was enroute from Brize Norton to the Falklands in 2013, and as the A330 taxied in at Ascension, it somehow ended up with a winglet jammed underneath the wing of another aircraft.
After some delay and discussion, I think the solution they came to was to keep the passengers onboard (presumably to keep the landing gear as loaded as possible), and refuel the wings asymetrically to lower the jammed tip to where they could move it clear. Then they removed the damaged winglet, and carried on South. The whole operation at Asi caused a delay of about 8 or 9 hours.