Tommy Tompson puts blue nylon overtrousers over his jeans. He slips his feet out of his Adidas and slides a plastic freezer bag over the sock on each foot. Then puts his sneakers on again. Ties them tight.

'Ready, Mrs Marx?' he huffs.

Penny Marx winks at him through her sunglasses. 'Line up with your buddies,' she yells to the kids who are all over the place in the snow, 'then number off.'