Yardly and Whiple, ages 12 and 13, intentionally threw stones which smashed 57 windows in an old warehouse. The warehouse had been standing vacant for nine months. Yardly and Whiple were caught and disciplined by the juvenile court. Then the owner of the warehouse sued them and their parents for damages. The girls said they were “just having fun and not hurting anyone because the place was empty.” Who, if anyone, is liable and why?