Sanitary Dining

A family friend of mine was giving a dinner party and discovered she was out of napkins.
She then proceeded to send her 10 year old son in the grocery store to get some. Upon his return she asked him to place one napkin beside each plate and put a knife, fork and spoon upon each one.
When all of her guests arrived she showed them into the dining area and to her horror found that her son had mistakenly purchased sanitary napkins!!