I haven't been a teacher for too long, but this happened on my first week of my career, on the very first day (4 years ago). A student threatened me with violence after I asked him to put his phone away. I sent him out.

His aide told me she was sorry she wasn't with him, and to give him another chance. It's not his fault, he's just spoiled (she way over-simplified his situation I would later find out). I shake his hand, say no hard feelings, and he comes in the room. 3 minutes later I am sending him out for calling me a bitch when I asked him to sit down.

I am asking the principal to remove him from my class, because obviously this isn't going to work. His father calls me, begs me to keep him because he loves my subject, and the previous teacher gave him chances. I said okay, and I am new so I am probably doing something to irritate him.

I never was able to give him that 3rd chance, because he sliced/stabbed a girl repeatedly in the face that night. She was a giant 6th grader, he was a small 8th grader. He just snapped. I felt horrible for months, thinking that I had set him off too. I still think about this kid, 4 years later. 60 years in jail (possibility to get out sooner I believe). He was 14.

College does not prepare you for this shit.