(Antonio Calanni/AP Photo)

This is the ultimate food fight.

The "Battle of the Oranges" is being held this week in the northern Italian city of Ivrea. Thousands of townspeople participate in the event, a yearly tradition during Carnival celebrations.

(Antonio Calanni/AP Photo)

The event has its roots in the Middle Ages.

(Antonio Calanni/AP Photo)

Participants wear costumes and protective gear, including helmets, trying to shield themselves against the flying fruit.

(Antonio Calanni/AP Photo)

Messy, good fun, filling the streets with pulp.

(Antonio Calanni/AP Photo)