Useful stuff?
Practice keeping that smile in place when you've woken up at 01:00z for a show at 02:30z, go at 04:00z and 1 of the pax has forgotten his passport...(Corporate jet ops).
Airline ops - just close the door, you're good to go. Although keeping cheery when the pax have imbibed too much alcohol and have decided to punch their way out. Cancel take off clearance, go back to stand, get the police. Call ops, refile the flight plan and lose all hope when the CTOT is now +2 hours....