Did you know that the origin of the 'piggy bank' actually had nothing to do with pigs?
In the late 15th century, metals were quite costly and were not used for housewares. Instead, pottery, dishes, containers and other items were made from a low cost clay material called 'pygg clay.' Pygg clay was known for it's durability and it's soft orange color.
In the day, people often reserved one of their pygg clay containers to save coins and other items. As times passed, these containers became known as a 'pygg bank.'
By the 19th century, more advanced methods were used for the creation of containers and dishes, yet people well remembered the history of the pygg clay containers. One artisan, unaware of the correct spelling of the clay referred to it as a 'pig bank' and the idea was born, to create a container in the shape of a pig to collect and save coins.
A bit of trivia to impress your friends. :)