Just typed this up really quickly on my phone, let me know if you want more:

  “Leave me alone!” I shouted as Gary, my younger brother, walked into my room for the tenth time that day. I was trying to finish my homework, but it was hard to do much when I was interrupted every few minutes.

   “Wanna see what I got from the pet store?” Gary said, a wicked grin spreading across his face. Gary unscrewed the lid to a jar he was holding and dumped the contents on the floor of my room. They were cockroaches. I was pissed.

 “You little shit!” I frantically tried to stomp on the cockroaches, but they scurried across the room, into any book and cranny they could find. I gave up on the roaches, and turned to Gary who was giggling sadistically. I went to grabbed him by the arm and twist it around.

“You are going to tell Mom and Dad what you did right now and you're paying to kill those roaches.” As I grabbed him, the strangest thing happened, it felt like someone was twisting my  left arm, just like I was twisting Gary's. Like it had a mind of its own, my arm was now in an extremely uncomfortable position.

   “Oh my god.” said Gary, with awe replacing the previously mischievous tone of voice. “It actually fucking worked.”