I'd say the best ones for me were the teachers in high school that understood we were too old to play the whole authority game any more - school with them became a place were I wanted to go learn from people who had more experience than me. Be it chemistry or an anecdote about their life, there was a lot to learn and a lot of teachers never forged that connection or taught us well because they still thought of us as mindless children. The ones that respected us were the ones I learnt from most and the ones I still appreciate to this day.