A Couple of years ago flying for Sabena we were at the gate in AMS all passengers on board except one buisinesman.
Lots of calls around the terminal to no avail.
From the flightdeck we could see into the waiting area and sighted a middleaged man sat alone reading a paper. By now it was 5mins passed our push time and the offending gents bag was now sitting on the tarmac.
At this point I requested the Cabin crew to close the doors and Turned on our Anti collision beacon indicating we were about to push back from stand.
Our 'gentleman' looked at the aircraft, looked at his watch got up and walked to the counter waving his boarding card at the Girl behind the desk.
It was with great satisfaction we taxied away from the gate with a very angry looking guy banging on the glass windows of the terminal
