I worked at an international airport in the Middle East a few years ago. A local hero there and an all round good egg, Tom, in the tower one day received a call from the electrical guys on their way to do their daily checks. "Tower, Electric One. Request clearance to cross the runway at Yankee." "Electric One, Tower. Hold." A few seconds later Tom receives another call, "Tower, Electric One. Request clearance to cross the runway at Yankee." Tom replies "Electric One, Tower. Hold." A few seconds later, the same call again, "Tower, Electric One. Request clearance to cross the runway at Yankee." Tom replies, "Electric One - If you look to your right you will see a Garuda 747 about to land. If you’ve got the courage, you've got the permission." After a couple of seconds, "Electric One - Holding."