I once saw him jump on some guys back and start punching him in the 7th grade.
We were sitting in the hall like good little nerds and Himuro was counting money in the hallway. This guy walking down the hallway put his foot on the money, dragged it a bit and picked it up. Himuro got up out of nowhere and started running after him. He jumped on the guys back and started punching him. The principals had to pull him off.
It was hilariously random.