Gatwick -> Edinburgh ?
As a lowly summer student (i.e. the cheapest person to pay w/e rates to) at an engineering company I was asked if I'd take a small suitcase of "special diodes"(*) from the London labs up to Edinburgh so they would have them for production start on Monday morning. So I booked some flights, arrived at a fog-bound Edinburgh airport, handed over the suitcase (at the airport), turned round and went straight back into departures. The buildings were high enough off the ground that, due to the fog, I could genuinely claim to have not seen Scotland at all on the trip.
Slightly odd thing was that the senior manager who had arranged it all, turned up at my house on Sunday evening to pay all my expenses and overtime (and rounded it all up generously) in cash. Which leads me to suspect that someone, somewhere had massively screwed up and needed it cleared up in as off-the-books way as possible so, although I was merely the cheapest pawn, I had contributed to saving someone's job...
(*) not a euphemism! Genuinely was a pack of very special, very expensive (probably zener) diodes...