Along the same lines, last week landed in INV 25 mins ahead of schedule. All pax boarded on time apart from one, who had forgotten his car keys. His wife was bringing them from the next town. My CAPT decided to wait until -5min STD to see if the keys would arrive. They didnt, and the pax decided to come without them. We departed -2min STD, having waited fully boarded for 20 mins for this one pax. What thanks did we get? On disembarkation in LTN the pax decided to mouth the word "B**tard" at my CAPT who was just leaving the FD.