I well remember arriving at Prestwick off the Atlantic one beautiful morning from New York. I was learning to fly the DC-10 at the time. As a ball-park rule we used to start our descent at a distance equal to 3 times the first two digits of the cruising altitude PLUS 10 miles to slow down.
Guess who forgot to allow 10 miles to slow down? "Sir" in the other seat said nothing and let me get on with it. A bit later on it became obvious to me that I wasn't going to make it and suddenly the penny dropped! An orbit around Ayrshire took care of the problem and the only thing broken was my pride.
I asked "Sir" why he hadn't say anything and he responded by saying that I would never do THAT again! He was right. In my defence I only had 8,000 hours at the time.