Speaking of stupid kid shit, there was a store that you could buy small vials of liquid cinnamon for dipping toothpicks in. One kid got some in his eye and was sent home. Then there was a rash of kids getting sent home for cinnamon in the eyes in the following weeks. Finally school banned the liquid cinnamon.
Another bit of stupid was eraser burns.
Kids would hyperventilate by breathing heavily with your head below your heart for a bit. Then stand up quickly against the wall or the lockers and another kid would push on their chest and they would pass out.
I personally loved crabapple fights. Me and my trusty wrist rocket, child against child neighborhood warfare. I remember half dollar size bruses everywhere.
Tying two trashcans across the street from one another together with SpiderWire fishing line.
Ahhh the good ol' days!