My best was my history teacher, he gave me loads of support and praise and convinced me I could do well at GCSE (and I did).
My worst is also that same teacher, paradoxically. I was beaten by one of his friends (I was walking about drunk, on my way home, had no idea he knew my teacher). He just grabbed me from behind, hit me on the head with a baseball bat, pinned me up and said he was going to chuck me in the lake below us, behind a wall. He asked me what school I went to, said he knew my teacher. Anyway, someone in a car who saw him hitting me (he hit my legs too when I tried to run) phoned the police and took me home, said the man was very sorry, he didn't know what happened.
Anyway, that Monday back at school, in history where the teacher was usually nice to me he just said right at the start I want to see you after the lesson, you know what it's about. I was nervous then after class he said 'oh, my friend is very sorry...you're not pressing charges are you'. Not worried about me. I don't know if I should have expected it but I felt...bad.