Video prompt: An underwater scene with schools of colorful fish swimming through coral reefs, sea turtles gliding by, and sunlight shimmering through the water from above.
Defect: Deformation (when Object is involved in an act,  anything in this process that's weird. e.g. people walk into a wall. "Walk" is an act)
Explanation: As the fish swim, they intermittently merge and split apart in a way that is unnatural, as their forms should remain distinct and separate during movement.