"Tan-tan-tanuki's testicles, there isn't even any wind but still go swing-swing-swing."

Wiki:

Tanuki (狸 or タヌキ^?) is the Japanese word for the Japanese raccoon dog (Nyctereutes procyonides viverrinus). They have been part of Japanese folklore since ancient times. The legendary tanuki is reputed to be mischievous and jolly, a master of disguise and shapeshifting, but somewhat gullible and absent-minded.

Tanuki is often mistakenly translated as raccoon or badger.

Statues of tanuki can be found outside many Japanese temples and restaurants, especially noodle shops. These statues often wear big, cone-shaped hats and carry bottles of sake in one hand, and a promissory note or empty purse in the other hand. Tanuki statues always have large bellies. The statues also usually show humorously large testicles, typically hanging down to the floor or ground, although this feature is sometimes omitted in contemporary sculpture.

Statues of tanuki can be found outside many Japanese temples and restaurants, especially noodle shops. These statues often wear big, cone-shaped hats and carry bottles of sake in one hand, and a promissory note or empty purse in the other hand. Tanuki statues always have large bellies. The statues also usually show humorously large testicles, typically hanging down to the floor or ground, although this feature is sometimes omitted in contemporary sculpture.

Organizers chose November 8 as the date for the Tanuki holiday because the emperor made his famous visit in November and because the tanuki has eight special traits that bring good fortune. The eight traits are: (1) a bamboo hat that protects against trouble, (2) big eyes to perceive the environment and help make good decisions, (3) a sake bottle that represents virtue, (4) a big tail that provides steadiness and strength until success is achieved, (5) over-sized testicles that symbolize financial luck, (6) a promissory note that represents trust, (7) a big belly that symbolizes bold decisiveness, and (8) a friendly smile.

The comical image of the tanuki is thought to have developed during the Kamakura era. The actual wild tanuki has unusually large testicles, a feature that has inspired humorous exaggeration in artistic depictions of the creature. Tanuki may be shown with their testicles flung over their backs like travellers' packs, or using them as drums. As tanuki are also typically depicted as having large bellies, they may be depicted as drumming on their bellies instead of their testicles -- particularly in contemporary art.

A common schoolyard song in Japan (the tune of which can be heard in the arcade game Ponpoko and a variation of which is sung in the Studio Ghibli film Pom Poko) makes explicit reference to the tanuki's anatomy:

Tan Tan Tanuki no kintama wa,

Kaze mo nai no ni,

Bura bura

Roughly translated, this means "Tan-tan-tanuki's testicles, there isn't even any wind but still go swing-swing-swing." It then proceeds to continue for several verses, with many regional variations. It is sung to the melody of an American Baptist hymn called "Shall We Gather At The River?".