Karen Foulds makes her living from laughter, selling novelty products which can turn a misanthrope into a giggling fool.

Her range includes singing hamsters and severed hands which scuttle across the floor at a startling speed.

Napoleon once called us a nation of shopkeepers, but Karen's brimming order book proves we are in fact a nation of practical jokers.

Now where's that whoopee cushion for the vicar's visit?