This week, the New Hampshire Supreme Court ruled that a group who goes around filling parking meters and heckling parking officers, are protected by the right to free speech. However, the state may soon pass new laws to create a "buffer zone" around parking officers, so they can not be approached by activists.

For years, groups of Keene residents known as "Robin Hooders" have walked the streets filling expired parking meters with their own money, in order to save people from getting parking tickets.

Occasionally, when they encounter an angry parking enforcer, they are prepared to film the situation with their smart phones.

When the Robin Hooders come across a car that already has a ticket on it, they will place some information on the person's windshield, which provides tips on how to beat the ticket in court.