We had a crew flying in Saudi Arabia. They were "cleared to XYZ".

They understood it to mean "cleared direct to XYZ", not "cleared FPR to XYZ".

So they turned direct to XYZ, in the process flew directly over Mecca.

Then, due to a technical glitch, they went NORDO for about 15 minutes.

On 9/11.

The Saudis were piiiiised.