When one of the knees gives way temporarily whilst walking causing a person to dip halfway to the ground before re-gaining control - therefore looking like a complete tit to any onlookers.

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.