Most residents in Wausau probably don’t know about an obscure ordinance against throwing snowballs on city property.  That ban includes sidewalks, streets, parks and schools.  The same ordinance is also on the books in Weston, Schofield, Rib Mountain, Marshfield, Merrill and Antigo.  City officials say it’s just common sense – you don’t throw stuff at people – but they admit that nobody can remember a time when a person was cited for the offense.