Goldman Sachs Asset Management has invented a great way to stop presenters at its seminars and meetings wandering off into the realms of irrelevance.

Taking a leaf from the Football Association rulebook, GSAM gives everyone at the meeting a plastic, Goldman-logo card with yellow on one side and red on the other. If you are dying to ask the speaker a question, you hold up the card with the yellow side showing. Holding up the red side means: 'Stop. You are boring the pants off me. Kindly get back to the subject at hand.'