My discrete mathematics course had an oral exam for the final exam. I took it as a summer course and the books didn’t arrive until 1/3 into the class’s.

I felt like I was BSing my entire oral exam but got an A.

I was never the same after that course. 10 hours a day of logical homework fundamentally changed how I thought.

To this day I still cringe when people use phrases like everyone or all without actually meaning the set of everyone in existence.