My discrete mathematics professor was like that. He would regurgitate a proof onto the whiteboard. Then he'd do it a few more times with proofs of other things.

My discrete mathematics professor was like that. He would regurgitate a proof onto the whiteboard. Then he'd do it a few more times with proofs of other things. He has an identical twin brother, who is also a math professor at the same college. The regular professor was out for a day, and his brother came in to teach the class. His teaching style was completely different. "Ok, we need to prove X. Where should we start?" and would sit on the table and look at us with an inquisitive look on his face. Then learning happened. Everyone's mind was blown. Most people didn't realize it was a different person. Then on Thursday it was back to same-old same-old. I still don't know shit about discrete math.