When somebody takes a shit in a toilet and after they flush, streaks are left down the inside of the bowl that look similar to the streaks left in mud next to a pond that turtles slide into.

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.