What is the worst thing a teacher ever did/said to you?

I grew up suffering from ADD and panic attacks, and for one year (5th grade) I had to go to some classes to help me cope with people (special ed classes, yes). The teacher was a child psychologist who believed you had to be tough on kids to get them to integrate better. One day I had a pretty rough panic attack, to the point where I couldn't even leave the school without just panicking and hyperventilating. The teacher (“Mr. O”) picked me up by the waist of my pants and carried me like a grocery bag down a hall, opened a room and threw me in.
My face hit a desk and my face was cut up. He locked me in the classroom until my parents got there; where he and other teachers claimed that I was being violent to other students (even thought I had left after the other students because I had to take a different bus, due to the classes). Three teachers and the assistant principal took my mother aside and said I was a danger to the school and that I was never to return. And that the cuts on my face were self inflicted, and that I ran into the room and locked myself in there, regardless that the room had to be locked by a key and only from the outside.
I was removed from the school and had to finish in remedial classes at another school across town and then go to summer school. Apparently, the teacher and the principal sent out letters to PTA members that their children should not associate with me. It took my parents a long time to convince the school district to allow me to go to 6th grade, because from the schools side the story had become that I was hitting teachers and threatening other students. Years later I had to pick up my brother from school and that same teacher (Mr. O) came out and saw me, and called the police who questioned me about “stalking” the teacher. He then began ostracizing my brother and harassing him for the next year.

I saw him last year. I put a brick through his car window.

tl;dr: Teacher threw me against a desk, claimed i did it to myself, got me expelled, harassed family

EDIT: I honestly felt very alone after all of this. It's been several years but these events still affect me, and so many of you. I feel far less alone now that i know how many this, or worse has happened to.

Love you reddit!