The Armadillo Theory is the theory that once a specific arbitrary object or idea has been mentioned obscurely , or encountered randomly, that this time object or idea will suddenly appear more frequently in one's life. This is strictly based on noticing something that was already occurring in one's life, but without significance.

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.