We VVIP chaps have many tales to tell.
At the top of drop, the Nav set his watch time exactly from his comprehensive nav kit. He then advised the pilots of timings, distance and even down to where to turn off the runway and what speed to taxi at, always remembering the phrase 'Safely, Smoothly and On Time'. In that order.
I remember taking Prince C to Riyadh once and we opened the doors exactly abeam the red carpet and to the second. Shortly after HRH departed in the Limo a very irate British colonel appeared on the flight deck to demand why we were 10 minutes early. I asked him what time he had on his watch and when did he last set it. His face went bright red and that was that. Stupid man.