What happens when zigzag throw the bag of sunflower seeds at Stanley?

In "Holes" by Louis Sachar, when Zigzag throws the bag of sunflower seeds at Stanley, it escalates the tension among the boys at Camp Green Lake. Stanley is unfairly targeted and bullied, which reflects the hostile environment of the camp. This incident also highlights the dynamics of power and vulnerability among the characters, emphasizing Stanley's struggles to fit in and stand up for himself. Ultimately, it contributes to the development of Stanley's character and his journey throughout the story.