Had a former soviet physicist back in cc. Similar idea. He made fun of students for pronouncing Greek letters wrong. Talked about detecting submarines using capacitance. Great instructor, intense, but great.

Then there’s the high school history teacher who was a Vietnam vet. Slapped a kid for joking about his story calling in artillery/strikes on bs positions(he was tired of seeing mass murders of civilians). Never got in trouble for it. Kid spent a week in detention. Also a great teacher!