He waggled a finger in warning, as if he were a professor before an abruptly unruly class.

I'd like to see David Cameron on his zimmer frame dealing with unruly classes in his late 60s.

He stood at attention, back to the viewer, and coughed loudly, as if calling an unruly class to order.

He emerged, with quiet assurance, before the five jostling ruffians, for all the world like a school-teacher calming an unruly class.

The camera moves from group to group like a teacher in an unruly acting class; the groups mix and mingle, the actors change roles.

'Come on now,' he raised his voice, like a schoolmaster addressing an unruly class.

And it doesn't take long for this sister to inspire a good deal of cheekiness in the paying members of her unruly class.

He wondered, reminded of a slightly ineffectual schoolmaster imploring an unruly class to pay attention on the last day of term.

Well, we mustn't waste any more time," he added, like a schoolmaster regaining control of an unruly class, "we'll turn north - see to it, Mr Much.

Adrian remembers elementary school as a blur of unruly classes.