This happen a while ago and we on VH-OJA when the plane was still very new and we were flying from Singapore to London and we got diverted to Copenhagen due to a fuel issue in the middle of winter.
Back then you could still smoke on planes and as they were refueling the plane they open the doors and we had that wonderful smell of jet fuel.
Not surprisingly a number of smokers attempted to light up a cigarette and were promptly told by the cabin crew to put it out or the plane could blow up
We ended up being 14 hours late as the crew timed out but I am sure many more of you have had much longer delays