10th century viking torture tactic in which the victim is tied up to a pole or wall with arms spread eagle style and back side out. The torturer then makes two cuts on both sides of the spine (one long slice on each side) to open and expose the victim's lungs. Generally, because they are more commonly tied to a pole, the lungs naturally pop out of the back. It is also common that, out of pain, the victim writhes and struggles to escape from being tied down and causes the lungs to flap about on their back, thereby looking like a "butterfly."

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.