I believe I have shared this story here before, but always a pleasure re-living the events.
AKL-MEL in EK First on the A380 with +1. It must have been 2011 or 2012, a week after Easter and a Sunday night. The flight would have gotten us home around 10pm ready for a Monday at the office after a 10-day roadtrip around NZ (and the EK First experience was meant to be a great ending to a beautiful trip - my first flight in F ever, I believe).
All went to plan at first - boarding on-time, settled in well in the suites, Dom as a welcome drink, push back on time. Then during taxi we suddenly stopped, just opposite the Domestic terminal. took some 10-15 mins before the CPT came on the PA telling us of some display issue they are trying to resolve, "won't be long". Another 5 or so minutes past and we started rolling again, only to stop again a few hundred meters later, and wait some more. CPT on the PA again: "okay folks, we will go back to the gate and wait for an engineer." So we did. Waited for a while, engineer came on board, something was happening. Then we were informed something was broken (I cannot remember what it was), but we were not going anywhere on this plane until a part had been replaced, and they were now sourcing that part. Updates to follow. It then turned out the part was in AKL but in bond storage, so they had to get it through customs and paperwork etc., plus fitting it, "at least another 2 hours" (by that time we were already 2 hours late).
The whole thing turned into somewhat of a rolling delay, 2 hours became 3 which became 4 ... Luckily the crew did not run out of hours! But we were very comfortable in F, with Dom and other drinks flowing, dinner on the ground, a proper bed to rest, etc. Meanwhile, the folks in Y were getting desperate (they also had to shut down the lavatories for an hour or so while the engineers were working on something; at the same time we were asked if we wanted to shower now or later when in the air!). So a few hours in everyone was allowed to de-board and stretch their feet, and they cordoned off the A380 pier for this flight. We had a chat with some guys who were going all the way to Europe, so this delay would have easily turned their journey into a 40+ hours affair (in Y!!).
Eventually everything was fixed and we were on our way. We must have finally left AKL around 2:30 or 3am, because we got into MEL around 5am. Caught some sleep on the flight over, but went to work in a less than ideal shape.
And now the best part: that same day, before I could even email EK customer service about the delay, I received an email with a sincere apology, and as a service recovery they were crediting us 40k Skywards points each (the flight was a reward and did cost around 45k, IIRC). I still had a few Skywards points in my account at that time, so what did we do? We did the exact same flight in EK F again, a few months later. Just this time without the delay. A great 2 for 1 experience!