Political Correctness
I guess that one has to be careful about what one says. I remember an incident where an Air Namibia captain, after landing in Windhoek, announced something along the following lines...
'We will soon be arriving at Windhoek airport. Please set your watches back 20 years. Thank you for flying Air Namibia.'
As I recall, he was shown the door. Some people can't take a joke, can they?