Via The Cellar Image of the Day, here’s a gallery of photos (warning, giant penis statues ahead, your work safeness may vary) and a video from Kanamara Matsuri, the annual Festival of the Steel Phallus. From Wikipedia:
The Kanamara Matsuri (Festival of the Steel Phallus) is an annual Shinto fertility festival held in Kawasaki, Japan in spring. The exact dates vary, but the main festivities fall on a Sunday. The penis forms the central theme of the event that’s reflected everywhere; in illustrations, candy, carved vegetables, decoration, a parade of mikoshis, etc. etc.
The Kanamara Matsuri is centered around a local penis-venerating shrine, once popular among prostitutes who wished to pray for protection against sexually transmitted diseases. Today, the festival is used to raise money for HIV research.