I'm sure he had done that at some point. He also liked to show off his many other amazing 'mind hacks' such as memorizing everyone's name within the first few

I'm sure he had done that at some point. He also liked to show off his many other amazing 'mind hacks' such as memorizing everyone's name within the first few minutes of the first day of class. There were almost 100 students in his class and after he said he was done 'doing his thing' he would ask the students to change seats and never sit in the same seat twice for the first week to test him.