KBUR, many years ago.
A DC-7 pulls up to the terminal, and no ground agent is in sight.
The airplane is parked, engines shut down, and the Captain's head is noticed from the open left DV window.
An agent appears.
The Captain yells...'hey, a**hole, where are the f*****g boarding stairs?
All 80 passengers that were waiting to board, have second thoughts, and depart the area.
Flight canceled.
The very next day, the offending Captain was 'canceled' from the company.