Its definitely possible…. I got stabbed by a teacher once.
Honestly in high school, i was a bit of a terrorist. I grew up being the class clown and puberty only served to magnify it exponentially, and iwould basically do anything to make the other kids laugh, including being verbally abusive to teachers.
We had this one teacher, and his reputation preceded him as being a bit of a doofus and pushover so i totally took advantage of that and did whatever i could to make him look foolish. There was a rumor that him and his wife got a divorce so one day i said something stupid like " hows your wife?" Or some shit like that.
He stood there, trembling in rage as he was holding a pen in his hand with no cap on it. He became so infuriated at hearing what i said that he instinctively just stabbed me in the stomach with the pen and walked away. I had perfectly timed this outburst with the schoolbell ringing as class was ending and no body really saw it because i sat in the back corner and he sort of blocked everyones view with his body, i swear it happened.
He didnt break skin or anything but that didnt stop me from playing it up and using a small red mark on my stomach to basically blackmail him into submission.
Im not saying i didnt deserve it either, but i think this type of stuff is what OP is referring to.
Anything that can happen, will happen right? Kids grow up so fast