That reminds me,last year a group of "alternate lifestyle" people camped all summer long under a bridge in my hometown. They had 3-4 dome tents and even a couple children. The group spent their days "spanging" locals at the nearby "hot spots", (it's a yuppie haven).

Early fall they were found out, a story was run in the daily paper and someone called the local health department. Before the inspector could get out there they had cleared out, even picked up all their trash, leaving nothing behind.