Cuttlefish
The cuttlefish are masters of illusion whose defense mechanisms change depending on what kind of creature they’re feeling threatened by. When smaller trouble makers swim by the cuttlefish they change their skin to make it look like they have giant eyes and when bigger fish get up in their space they rapidly change their color and swim in erratic patterns. Cuttlefish, not worth the trouble.
Source: http://skaphandrus.com/en/underwater-photography/photo/28953