The Japan Toilet Association celebrates an unofficial Toilet Day on November 10, because in Japan the numbers 11/10 (for the month and the day) can be read as ii-to(ire), which also means "Good Toilet".
日本廁所協會將11月10日定為非官方的「廁所日」，因為11/10日文能讀做「ii-to(ire)」，又有「好的廁所」之意。