Martial art ingredients ( feel free to add further points) 1. Traditional principles of martial arts, philosophy and techniques, monkey, dragon, shoalin monks, bushido,samurai, ninja. 2. Weapons: swords, blades, assorted objects used to inflict pain and death, but excluding guns, so a yakuza film with no guns might be included. 3. Plotlines : revenge, training / culminating in a a final showdown. (KIll BILL!) Old Boy has all three elements as the fight scenes included a mix of hand to hand combat and brawling.