Worst for holding a grudge

 There was a grandma who had a poinsettia at Christmas time. Her two and a half year old granddaughter pulled all the red leaves off the plant while nobody was paying attention. The grandma would mention the incident every time the granddaughter visited her. The grandma was stern and there was no humor in the telling of the story. She clearly was still annoyed with the granddaughter - even when the granddaughter was an adult.