The Hardest Exam I Ever Took at MIT in Physics

I was a physics and math major in the slide rule days.  In a physics class they passed back the tests, mine was a 35 (out of 100).  I thought "i'm hosed"..  However it turns out I was the highest score in the class.  I certainly do not miss the tests.  After a full career, I have to say none of the physics and math was directly used by me in business (in technology/software) but the reasoning that I learned was used every day.