A chain of men, standing in a circle are having simultanious anal sex with each other. To accomodate this, the uneven members of the chain provide the movement, while the rest remains stationairy.
The phenomenon is said to look like a caterpillar.
Caterpillar-sex is said to be extremely pleasureable, but it takes a lot of practice.

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.