Similar to the normal zerbert, this is when one individual uses his or her mouth to create a seal with another individual's back and then blowing, producing a fart-like sound. The back zerbet is often more tricky to pull off given the higher concentration of muscles compared to the stomach and so it is best pulled off by an experienced zerbet giver.

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.