At the airport for a business trip, Maureen settled down to wait for the boarding announcement at Gate 35. Then she heard the voice on the public address system saying, 'We apologise for the inconvenience, but BOAC Flight 937 will board from Gate 41.'
Maureen picked up her luggage and carried it over to Gate 41. Not ten minutes later the public address voice told her that Flight 937 would in fact be boarding from Gate 35.
So, again, Maureen gathered her carry-on luggage and returned to the original gate. Just as she was settling down, the public address voice spoke again, 'We would like to thank all passengers for participating in BOAC's physical fitness programme.'