If you wear a blacksmith apron and start dancing, you'll start hitting an anvil.
There is a comic on community.clubpenguin.com/comics, and its name is Anvil Counters, which is about anvils being thrown out in the game Bean Counters, and anvils are mentioned in another comic called "No Anvils??", which is about a penguin complaining to a barista of the Coffee Shop about having no anvils to go with his coffee.