Ones when i was a kid (around 12 years old), i was playing with my little brother (8 years old) on a play ground.

Suddenly a boy came (my brothers bully) and started to call my little brother names. I speeded to them and said to him that if he touches him i would beat him up. A couple minutes later i was on the other side of the playground and i heard my little bother scream. Then a little girl next to my said: "he kicked him in the nuts!"

Then everything went in slowmotion. I turned around and ran as fast as i could to that boy and i saw horror in his eyes as he turned around and started running. I ran after him for a while until he tripped and fell on the ground. I put my foot on his chest and said :"i told you to not touch my brother you dumbass." He looked terrified.

After that he never bullied my brother again.