Video prompt: A cyclist is speeding down a forest trail, leaves crunching under the tires. Sunbeams filter through the canopy, creating dappled light patterns.
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: The bicycle tire, initially round, undergoes unnatural shape changes as it rolls, which is unrealistic as it should maintain a consistent circular shape.