The "Seven Minute Rule" states quite simply that if the meeting organizer has not joined the meeting within 7 minutes of the start time - the meeting is therefore officially cancelled.
It was designed by the British Upper Class to ensure punctuality and minimize time wasting.
With globalization and in particular the deterioration of Corporate Culture around the world - this rule is making a comeback and used throughout offices around the world
"Mark set this meeting up, and he's not here, by the Seven Minute Rule the meeting is cancelled and we can go to the beach!"