When it comes to communication it's surprising to learn that as little as 7 per cent of a communication's effectiveness can be attributed to words alone with voice quality contributing 38 per cent and 'non verbals' providing the remaining 55 percent.
Most people won't believe you when you give them these figures which kind of proves the point so rather than trying to argue the point, try this exercise which is also a great deal of fun.
Divide the group into pairs and give one person in each pair a card with a simple task that they should communicate to their partner. Examples of the type of task would be: 'Close the door', 'Open the window', 'Scratch my back' etc.
They can communicate with each other any way they like gestures, sounds, tone of voice with the exception that they can't use recognisable words. The exercise finishes when the task has been completed.