Make sure when you get off an airplane, you have the right local time at your wrist.
I was in Madrid, waiting for my final plane back to New York. Boarding time was 12:35. I reached Madrid at 10:30, so I had more than two hours of purposeless wandering ahead of me.
It was not until an hour later that I realized, by chance, that the local time was not 11:30, but 12:30, time for me to board. Why? Because there exists a one-hour time difference between Tenerife and Madrid. My watch was one hour slow on Madrid time.
If a gentleman did not ask for me the time, I would have been slacking around the airport, while my flight would depart, leaving me stranded in Europe for 24 extra hours.
Being stuck overnight in Spain would be a minor, but annoying incident. I have had other my share of travel incidents. You want to hear the stories?
(The Traveller, Sunday, February 17, 2002)