Bwca or Pwca
The Bwca, or Pwca, is the Welsh version of the brownie. It is a helpful creature who, in exchange for a bowl of cream, is willing to perform small labors such as the churning of butter. If he is treated badly, the Bwca will pound the walls, throw small objects, pinch people in their sleep, destroy clothes and reveal secrets. He despises teetotalers and people with long noses.