One time my next door neighbor Eric was like seven years old, and this kid across the street, Danny, who was about twelve, was picking on him. So, Eric ran home crying and told his dad. Well, his dad opened the garage and Eric came running out with a woofle ball bat and chased Danny up and down the street. Danny was screaming like a little girl. Then, Danny's parents got all mad at Eric's dad, but Eric's dad was like, "Hey, he shouldn't pick on smaller kids." It was classic!
Here's another story: My cousin's kid was like six years old, I think he's seven now, and knows Karate. So, when he was in First Grade, these three Fifth Graders were pushing him around and he totally punched one of them in the face and kicked him in the head. The other Fifth Graders got scared and told the Principal. They had a parents meeting, and my cousin was like, "Hey, they shouldn't pick on kids that are smaller than them." It was classic as well.